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SEO & digital marketing glossary

110 plain-English definitions — each linked to a free tool that checks or calculates it.

A

A/B Testing
Showing two versions of a page, ad or email to randomly split audiences to see which performs better on a chosen metric, such as conversion rate. Reliable tests fix the sample size in advance, run for full weekly cycles and check statistical significance before declaring a winner. Try: A/B Test Significance Calculator
AEO (Answer Engine Optimization)
The practice of structuring content so search features and AI assistants can use it as a direct answer. It emphasises clear question-based headings, concise self-contained answers, accurate facts and structured data. AEO overlaps heavily with traditional SEO and with generative engine optimization (GEO). Try: AI Search Readiness Checker
AI Crawler
An automated bot run by an AI company that fetches web pages, either to collect training data (such as GPTBot or CCBot) or to retrieve pages for live AI search answers (such as OAI-SearchBot or PerplexityBot). Site owners can allow or block each one by user agent in robots.txt. Try: AI Crawler Access Checker
AI Mode
A conversational search experience in Google Search that answers complex questions with AI-generated responses, follow-up questions and links to sources. It uses Google's normal search index and Googlebot crawling, and its traffic is reported within Search Console's overall Search performance data. Try: Search Console Performance Analyzer
AI Overviews
AI-generated summaries that appear at the top of some Google search results, with links to the web pages used as sources. Pages are eligible if they are indexed and can be shown with a snippet; there is no special markup. Site owners can limit use of their content with nosnippet or data-nosnippet. Try: AI Search Readiness Checker
Alt Text
The alt attribute on an HTML image that describes what the image shows. Screen readers read it aloud for visually impaired users, and search engines use it to understand images. Purely decorative images should use an empty alt attribute (alt="") so assistive technology skips them. Try: Image Alt Text Checker
Anchor Text
The visible, clickable words of a hyperlink. Search engines use anchor text as a clue to what the linked page is about, so descriptive anchors help both users and SEO. Generic anchors like 'click here' waste that signal, while over-optimized exact-match anchors from other sites can look manipulative. Try: Link Analyzer (Nofollow, Sponsored, UGC)
Attribution Model
The rule used to divide credit for a conversion among the marketing touchpoints that led to it. Examples include last click, first click, linear and data-driven attribution. GA4 uses data-driven attribution by default for key events, though the model chosen changes how valuable each channel appears. Try: Marketing Attribution Model Calculator

B

BIMI
Brand Indicators for Message Identification, a standard that lets supporting inboxes show a brand's logo next to authenticated emails. It requires DMARC at an enforcement policy (quarantine or reject) and, for providers such as Gmail, a Verified Mark Certificate or Common Mark Certificate. Try: DMARC Record Checker
Bounce Rate
In GA4, the percentage of sessions that were not engaged, meaning they lasted under 10 seconds, had no key event and viewed only one page. It is the inverse of engagement rate. In email marketing, bounce rate instead means the share of messages that could not be delivered. Try: Email Marketing Metrics Calculator
Break-Even ROAS
The return on ad spend at which advertising covers its own cost and the product cost, so profit is zero. It is calculated as 1 divided by the profit margin; a 25% margin gives a break-even ROAS of 4. Campaigns below this level lose money on each sale. Try: Break-Even ROAS Calculator

C

Cannibalization (Keyword)
When two or more pages on the same site target the same search query and compete with each other. Google may alternate between them, and neither ranks as well as one strong page would. The usual fix is to merge pages, differentiate their intent or clarify which page is primary. Try: Keyword Cannibalization Checker
Canonical URL
The preferred version of a page when several URLs show the same or very similar content. Site owners suggest it with a rel="canonical" link tag or HTTP header, and search engines usually consolidate signals to that URL. Google treats the canonical as a strong hint rather than a strict directive. Try: Canonical Tag Checker
Cart Abandonment Rate
The percentage of shopping sessions where items are added to the cart but the purchase is not completed. Common causes include unexpected shipping costs, forced account creation, limited payment options and a slow or confusing checkout process. Try: Cart Abandonment Rate Calculator
Citation (Local)
An online mention of a business's name, address and phone number, typically on directories, maps platforms, review sites or social profiles. Consistent citations help customers and search engines trust a business's details. In India, platforms such as Justdial, IndiaMART and Sulekha are common citation sources. Try: NAP Consistency Checker
Click-Through Rate (CTR)
The percentage of people who click after seeing a link, ad or email: clicks divided by impressions, times 100. In SEO, Search Console reports CTR per query and page. Titles, descriptions, rich results and position all influence it, and low CTR at a good position often signals weak snippet copy. Try: CTR Calculator
Cloaking
Showing search engines different content from what users see, in order to manipulate rankings. It violates Google's spam policies. Legitimate practices such as paywalls marked up with structured data, or serving the same content in a different layout for mobile, are not considered cloaking.
CLS (Cumulative Layout Shift)
A Core Web Vitals metric that measures how much visible content unexpectedly moves while a page is in use. A good score is 0.1 or less at the 75th percentile of visits. Common causes are images without dimensions, late-loading ads or embeds, and web fonts that swap in. Try: Core Web Vitals Checker
Content Decay
The gradual decline in traffic or rankings of a page over time, often because information becomes outdated, competitors publish better content or search intent shifts. Spotting decay early by comparing clicks across periods lets you refresh, expand or consolidate pages before losses grow. Try: Content Decay Checker
Conversion Rate
The percentage of visitors, clicks or recipients who complete a desired action, such as a purchase, sign-up or lead form. It is conversions divided by the relevant total, times 100. Comparing conversion rates by channel, page and device shows where improvements will have the most impact. Try: Conversion Rate Calculator
Core Web Vitals
Google's set of real-user metrics for page experience: Largest Contentful Paint (loading, good at 2.5 seconds or less), Interaction to Next Paint (responsiveness, 200 ms or less) and Cumulative Layout Shift (visual stability, 0.1 or less). They are measured at the 75th percentile using Chrome UX Report data. Try: Core Web Vitals Checker
CPA (Cost per Acquisition)
The average advertising cost to win one conversion, such as a sale or sign-up: total spend divided by conversions. CPA is a core efficiency metric in paid campaigns and is often used as a bidding target. Comparing it with customer value shows whether acquisition is profitable. Try: CPA Calculator
CPC (Cost per Click)
The amount an advertiser pays for each click on an ad, calculated as total cost divided by clicks. In auction-based platforms like Google Ads, the actual CPC depends on competitors' bids, ad quality and expected impact of ad formats, and is often lower than the maximum bid. Try: CPC Calculator
CPM (Cost per Mille)
The cost of 1,000 ad impressions, calculated as cost divided by impressions, multiplied by 1,000. CPM is the standard pricing and comparison metric for awareness campaigns on display, video and social platforms, where the goal is reach rather than clicks. Try: CPM Calculator
Crawl Budget
The number of URLs a search engine is able and willing to crawl on a site in a given period, shaped by server capacity and how much the engine wants to crawl the content. It mainly matters for very large or fast-changing sites. Duplicate parameter URLs and redirect chains waste it. Try: URL Parameter Analyzer
Crawl Depth
The number of clicks needed to reach a page from the homepage by following internal links. Pages buried many levels deep tend to be crawled less often and receive less internal link value. Flatter architecture and good hub pages keep important content within a few clicks. Try: Crawl Depth Checker
CrUX (Chrome UX Report)
A public dataset of real-user performance measurements from opted-in Chrome users, covering metrics like LCP, INP and CLS. Google uses CrUX field data for Core Web Vitals, reported over a rolling 28-day window. Pages or sites with too little traffic may not have CrUX data. Try: Core Web Vitals Checker
Customer Acquisition Cost (CAC)
The total sales and marketing cost of winning one new customer, calculated over a period as all acquisition spend divided by new customers gained. Unlike CPA, CAC usually includes salaries, tools and agency fees. It is often compared with customer lifetime value to judge growth efficiency. Try: Customer Acquisition Cost (CAC) Calculator
Customer Lifetime Value (CLV)
An estimate of the total revenue or gross profit a business can expect from a customer over the whole relationship. A simple version multiplies average order value by purchase frequency and expected customer lifespan. CLV helps decide how much you can afford to spend on acquisition. Try: Customer Lifetime Value (CLV) Calculator

D

Data-nosnippet
An HTML attribute that marks parts of a page Google should not use in search snippets, including AI Overviews and AI Mode. It can be added to span, div and section elements. It lets you protect specific text while the rest of the page remains eligible for snippets. Try: Meta Robots & X-Robots-Tag Checker
DKIM
DomainKeys Identified Mail, an email authentication method that adds a cryptographic signature to messages. Receiving servers check the signature against a public key published in DNS under a selector, confirming the message was authorised by the domain and not altered. Keys of 2048 bits are recommended. Try: DKIM Record Checker
DMARC
Domain-based Message Authentication, Reporting and Conformance, a DNS policy that tells receiving servers what to do with mail that fails SPF and DKIM alignment: none, quarantine or reject. It also requests aggregate reports. Gmail and Yahoo require a DMARC record for bulk senders. Try: DMARC Record Checker
Doorway Page
A page created mainly to rank for specific searches and funnel visitors elsewhere, offering little unique value. Typical examples are many near-identical city or keyword pages. Doorway abuse violates Google's spam policies; location pages are fine when they contain genuinely useful local information. Try: Content Similarity Checker
Duplicate Content
Substantial blocks of content that are identical or very similar across multiple URLs, on one site or across sites. It is not a penalty by itself, but it splits signals and lets search engines pick a version you did not intend. Canonical tags, redirects and unique copy resolve most cases. Try: Duplicate Content Checker (Two URLs)

E

E-E-A-T
Experience, Expertise, Authoritativeness and Trust, a framework from Google's search quality rater guidelines describing what makes content credible. Trust is the most important element. E-E-A-T is not a single ranking factor, but Google's systems aim to reward content that demonstrates these qualities, especially on YMYL topics.
Email Open Rate
The percentage of delivered emails that were recorded as opened. It has become less reliable since Apple Mail Privacy Protection began pre-loading images, which inflates opens. Clicks, conversions and replies are now better measures of engagement for most campaigns. Try: Email Marketing Metrics Calculator
Engagement Rate
In GA4, the percentage of sessions that were engaged: lasting longer than 10 seconds, having a key event or viewing two or more pages. On social media, engagement rate usually means interactions such as likes, comments and shares divided by followers or reach. Try: Engagement Rate Calculator
Entity
A uniquely identifiable thing such as a person, organization, place, product or concept that search engines represent in a knowledge graph. Entity-based SEO helps engines connect your brand and content to the right real-world thing, using consistent names, structured data and sameAs links. Try: Organization Schema Generator

F

Faceted Navigation
Filters on category or search pages, such as size, colour, brand and price, that let users narrow results. Each filter combination can create a new URL, producing huge numbers of near-duplicate pages. Good setups index only valuable facets and keep the rest out of crawl paths. Try: URL Parameter Analyzer
Funnel
The sequence of steps users take toward a goal, such as landing page, product view, add to cart, checkout and purchase. Measuring the drop-off between each step shows where users leave and where improvements will lift overall conversion the most. Try: Conversion Funnel Calculator

G

GA4 (Google Analytics 4)
Google's current analytics platform, which replaced Universal Analytics in 2023. It uses an event-based data model where page views, clicks and purchases are all events with parameters. GA4 offers key events, explorations, BigQuery export and consent mode integration for web and app data. Try: GA4 Event Builder & Naming Checker
GEO (Generative Engine Optimization)
Optimizing content and brand presence so generative AI systems such as ChatGPT, Gemini, Perplexity and Google's AI features mention or cite you in their answers. Tactics include accessible, well-structured content, original data, strong entity signals and authoritative third-party mentions. It builds on traditional SEO rather than replacing it. Try: AI Search Readiness Checker
Google Business Profile
Google's free business listing that appears in Maps and local search results, previously called Google My Business. It shows a business's name, categories, address or service area, hours, photos, reviews and posts. The description can be up to 750 characters and posts up to 1,500 characters. Try: Business Profile Description Checker
Google-Extended
A robots.txt user-agent token that lets site owners control whether content crawled by Google is used to train and ground Gemini models. It does not affect inclusion or ranking in Google Search, including AI Overviews and AI Mode, which rely on regular Googlebot crawling. Try: AI Crawler Access Checker
Googlebot
Google's web crawler. It mainly crawls as a smartphone user agent, because Google uses mobile-first indexing, and renders pages using a recent version of Chrome. You can verify genuine Googlebot traffic with reverse DNS lookup, since many bots fake its user agent. Try: robots.txt Tester

H

Hreflang
An HTML link attribute, HTTP header or sitemap annotation that tells search engines which language and optional region a page targets, and lists its alternate versions. It helps Google show the right version to each user. Annotations must be reciprocal and use valid ISO language and region codes. Try: Hreflang Checker
HSTS
HTTP Strict Transport Security, a response header that tells browsers to connect to a site only over HTTPS for a set period. It prevents protocol downgrade attacks and removes the insecure first request to http://. Sites can also apply to be included in browsers' HSTS preload lists. Try: Security Headers Checker

I

Indexability
Whether a page can be added to a search engine's index, based on signals such as HTTP status, robots.txt access, meta robots or X-Robots-Tag directives and canonical tags. An indexable page can still be left out for quality reasons, but a non-indexable one never appears. Try: Indexability Checker
IndexNow
An open protocol, supported by Bing, Yandex and others, that lets websites instantly notify participating search engines when URLs are added, updated or deleted. A site hosts a key file and pings an endpoint with changed URLs. Google does not currently use IndexNow. Try: XML Sitemap Generator
INP (Interaction to Next Paint)
The Core Web Vitals metric for responsiveness, which replaced First Input Delay in March 2024. It measures the delay between user interactions such as taps and key presses and the next visual update, reporting close to the worst interaction. A good INP is 200 milliseconds or less. Try: Core Web Vitals Checker

J

JSON-LD
JavaScript Object Notation for Linked Data, the structured data format Google recommends. It is placed in a script tag, separate from the visible HTML, and describes entities such as organizations, products or articles using schema.org vocabulary. It is easier to maintain than Microdata or RDFa. Try: Schema Markup Generator (JSON-LD)

K

Key Event
A GA4 event marked as important to the business, such as a purchase, lead or sign-up. Google renamed GA4 'conversions' to 'key events' in 2024; the word conversions is now used for actions imported into Google Ads for bidding and reporting. Try: GA4 Event Builder & Naming Checker
Keyword Clustering
Grouping related search queries that share the same intent and can be served by a single page. Clustering prevents creating separate thin pages for close variants and helps plan site architecture. Clusters are often built by comparing which queries return overlapping search results. Try: Keyword Clustering Tool
Keyword Density
The percentage of words on a page that match a given keyword. It is an old metric with no ideal value in modern SEO. It is mainly useful for spotting unnatural repetition, since keyword stuffing makes content worse and conflicts with Google's spam policies. Try: Keyword Density Checker
Knowledge Panel
An information box in Google results about an entity such as a company, person or place, drawn from Google's Knowledge Graph and sources like Wikipedia and official sites. It cannot be bought. Consistent entity information and Organization or Person structured data can help Google understand the entity. Try: Organization Schema Generator

L

Lazy Loading
Delaying the loading of images, iframes or other resources until they are about to enter the viewport, often with loading="lazy". It saves bandwidth and speeds up initial load. The main above-the-fold image should not be lazy-loaded, because that delays Largest Contentful Paint. Try: Lazy Loading & Responsive Image Checker
LCP (Largest Contentful Paint)
The Core Web Vitals metric for loading. It measures when the largest image or text block in the viewport finishes rendering. A good LCP is 2.5 seconds or less at the 75th percentile. Slow server response, render-blocking resources and large unoptimized hero images are common causes. Try: Core Web Vitals Checker
LLM (Large Language Model)
An AI model trained on large amounts of text to predict and generate language, such as the models behind ChatGPT, Gemini, Claude and Llama. In search, LLMs power AI answers that summarise information and, when connected to retrieval systems, cite web pages as sources. Try: AI Crawler Access Checker
llms.txt
A proposed Markdown file placed at a site's root (/llms.txt) that gives language models a concise summary of the site and curated links to its most useful content. It is a community proposal from llmstxt.org, and no major search engine has said it uses it for ranking. Try: llms.txt Generator
Local Pack
The block of usually three business listings with a map that appears in Google results for searches with local intent, such as 'dentist near me'. Results come from Google Business Profiles and are ranked mainly on relevance, distance and prominence. Try: Local Landing Page Checker
Long-Tail Keyword
A longer, more specific search phrase with lower individual search volume, such as 'waterproof trekking shoes for women under 3000'. Long-tail queries often have clearer intent and less competition, and together they make up a large share of all searches. Try: Long-Tail Keyword Generator
LTV:CAC Ratio
Customer lifetime value divided by customer acquisition cost. It shows how much value each customer generates relative to the cost of winning them. A ratio around 3:1 is a commonly cited healthy benchmark, while a ratio below 1 means the business loses money on each new customer. Try: LTV to CAC Ratio Calculator

M

Merchant Center
Google's platform for uploading product data so items can appear in Shopping ads, free product listings and other Google surfaces. Products are submitted through a feed or structured data and must meet attribute requirements and policies, such as accurate price, availability and identifiers. Try: Google Merchant Center Feed Validator
Meta Description
An HTML meta tag summarising a page's content. Search engines may show it as the snippet under the title, though Google often rewrites it based on the query. It is not a direct ranking factor, but a relevant, compelling description can improve click-through rate. Try: Meta Tag & Open Graph Generator
Meta Robots Tag
An HTML meta tag that gives page-level instructions to search engines, such as noindex, nofollow, nosnippet or max-image-preview. It can target all crawlers or a specific bot like googlebot. For non-HTML files, the same directives are sent with the X-Robots-Tag HTTP header. Try: Meta Robots & X-Robots-Tag Checker
Mixed Content
Resources such as images, scripts or stylesheets loaded over insecure http:// on a page served over https://. Browsers block active mixed content like scripts and may upgrade or warn about passive content like images. It undermines security, can break page features and shows warnings to users. Try: Mixed Content Checker
Mobile-First Indexing
Google's approach of using the mobile version of a page's content for indexing and ranking. Content, links, structured data and metadata missing from the mobile version may be ignored. Responsive design that serves the same HTML to all devices is the simplest way to avoid gaps. Try: Mobile-Friendly Checker

N

NAP
Short for Name, Address and Phone number, the core details of a local business. Keeping NAP identical on your website, Google Business Profile and directory listings helps customers and search engines trust that the information is accurate and refers to the same business. Try: NAP Consistency Checker
Negative Keyword
A term added to a search ad campaign or ad group to stop ads showing for queries containing it, such as 'free' or 'jobs'. Negative keywords cut wasted spend on irrelevant searches. They have their own match types and do not automatically match close variants. Try: Negative Keyword List Builder
Nofollow
A rel attribute value that tells search engines a link should not pass ranking credit. Since 2019 Google treats nofollow, sponsored and ugc as hints rather than strict directives. As a meta robots value, nofollow tells crawlers not to follow any links on the page. Try: Link Analyzer (Nofollow, Sponsored, UGC)
Noindex
A directive, given in a meta robots tag or X-Robots-Tag header, that tells search engines not to include a page in their index. The page must remain crawlable for the directive to be seen, so blocking it in robots.txt can stop noindex from working. Try: Meta Robots & X-Robots-Tag Checker

O

Open Graph
A set of meta tags, originally from Facebook, that control how a page appears when shared on social and messaging apps, including title, description, image and URL. Platforms such as LinkedIn and WhatsApp also read them. An image of around 1200×630 pixels works well for most previews. Try: Open Graph & Social Preview Checker
Orphan Page
A page that exists on a site but has no internal links pointing to it, so users and crawlers cannot reach it by navigating. Orphan pages are often found only through sitemaps or old backlinks. Linking them from relevant pages, or removing them, fixes the problem. Try: Orphan Page Finder

P

People Also Ask
A Google results feature showing related questions that expand to reveal short answers with source links. It reveals the follow-up questions searchers have about a topic, making it a useful source of question keywords and subheadings for content. Try: Question Keyword Generator

Q

Quality Score
A Google Ads diagnostic rated from 1 to 10 at the keyword level, based on expected click-through rate, ad relevance and landing page experience. It estimates ad quality compared with other advertisers. It is not a direct auction input, but the factors behind it affect ad rank and costs. Try: Google Ads Preview & RSA Builder

R

Redirect (301 vs 302)
A server response that sends users and crawlers from one URL to another. A 301 or 308 signals a permanent move and consolidates signals to the new URL; a 302 or 307 signals a temporary move. Use permanent redirects for migrations and removed pages with a replacement. Try: Redirect Checker
Redirect Chain
A sequence of two or more redirects between the requested URL and the final destination, such as http → https → www → new path. Chains slow users, waste crawl resources and risk losing signals. Each redirect should point directly to the final URL in a single hop. Try: Redirect Checker
Regex (Regular Expression)
A pattern language for matching text, used in SEO for filtering URLs and queries, building redirect rules and defining analytics segments. Google Search Console and GA4 use RE2 syntax, which does not support lookaheads or lookbehinds. Try: Regex Tester for SEO
Rendering
The process of executing a page's HTML, CSS and JavaScript to produce what users see. Google renders pages with an up-to-date Chromium, but content that appears only after JavaScript runs may be indexed later. Many AI crawlers do not render JavaScript at all. Try: HTML Source Code Viewer
Responsive Search Ad (RSA)
The standard Google Ads search format, where advertisers provide multiple headlines and descriptions and Google tests combinations. An RSA can include up to 15 headlines of 30 characters, 4 descriptions of 90 characters and 2 display path fields of 15 characters. Try: Google Ads Preview & RSA Builder
Return on Ad Spend (ROAS)
Revenue generated from advertising divided by the ad cost, often shown as a ratio or percentage. A ROAS of 4 means ₹4 in revenue for every ₹1 spent. Because it ignores product and operating costs, it should be compared with break-even ROAS to judge profitability. Try: ROAS Calculator
Rich Results
Search results enhanced with extra visual elements such as product prices, review stars, recipe images or breadcrumbs, usually enabled by structured data. Eligibility does not guarantee display. Google has retired several types, including HowTo in 2023 and FAQ rich results for all sites in May 2026. Try: Schema Markup Validator
robots.txt
A plain-text file at a site's root that tells crawlers which paths they may or may not crawl, following RFC 9309. It controls crawling, not indexing, so blocked URLs can still appear in results if linked elsewhere. It is publicly readable and is not a security measure. Try: robots.txt Tester

S

Schema Markup
Structured data using the schema.org vocabulary that describes the meaning of page content, such as a product's price or an article's author, in a machine-readable way. Search engines use it to understand pages and enable rich results. Google recommends the JSON-LD format, and markup must match visible content. Try: Schema Markup Generator (JSON-LD)
Search Console
Google's free service for site owners to monitor how their site performs in Google Search. It reports queries, clicks, impressions and positions, indexing status, Core Web Vitals and security issues, and lets you submit sitemaps and inspect URLs. Its regex filters use RE2 syntax. Try: Search Console Performance Analyzer
Search Intent
The goal behind a search query, commonly grouped as informational (learn), navigational (find a site), commercial (compare options) and transactional (buy or act). Pages rank best when their format and content match the dominant intent Google shows for a query. Try: Search Intent Checker
Semantic HTML
Using HTML elements according to their meaning, such as header, nav, main, article, headings, lists and tables, rather than generic divs. It improves accessibility and makes it easier for search engines and AI systems to identify the main content and its structure. Try: Semantic HTML Checker
SERP
Search Engine Results Page, the page a search engine shows in response to a query. Modern SERPs mix organic results with ads, AI Overviews, local packs, videos, images, People Also Ask and shopping results, so ranking first organically does not always mean appearing first on screen. Try: Google SERP Snippet Preview
Site Reputation Abuse
A Google spam policy against publishing third-party pages on a host site mainly to exploit that site's ranking signals, such as unrelated coupon or payday-loan sections on news sites. Google clarified in 2024 that first-party involvement or oversight does not make such content acceptable.
Sitemap (XML)
A file listing URLs you want search engines to discover, optionally with last-modified dates. A single sitemap can hold up to 50,000 URLs or 50 MB uncompressed, and a sitemap index can group several. Google ignores priority and changefreq values and no longer accepts sitemap pings. Try: XML Sitemap Validator
Soft 404
A page that tells users it does not exist or has no useful content but returns a 200 OK status instead of 404 or 410. Search engines treat these as errors, and they waste crawl activity. Mass redirects of removed pages to the homepage are often treated as soft 404s too. Try: Soft 404 Checker
Spam Complaint Rate
The share of delivered emails that recipients mark as spam. Gmail requires bulk senders to keep it below 0.3%, and aiming under 0.1% is safer. It can be monitored in Google Postmaster Tools and through feedback loops from other mailbox providers. Try: SPF, DKIM & DMARC Checker
SPF
Sender Policy Framework, an email authentication method where a domain publishes a TXT record listing the servers allowed to send mail for it. A domain must have only one SPF record, and evaluating it may require no more than 10 DNS lookups, or SPF returns a permanent error. Try: SPF Record Checker
Striking Distance Keywords
Queries for which a page already ranks just outside the top results, typically positions 8 to 20. Because Google already sees the page as relevant, improving content, titles and internal links for these keywords is often faster than targeting completely new ones. Try: Striking Distance Keyword Finder
Structured Data
Information organized in a standardized format so machines can interpret it reliably. In SEO it usually means schema.org markup in JSON-LD, Microdata or RDFa that describes page entities and properties. It can make pages eligible for rich results and helps search and AI systems understand content. Try: Structured Data Extractor

T

Thin Content
Pages with little original or useful content, such as near-empty category pages, scraped text, doorway pages or auto-generated pages. Thin content offers users little value and tends not to rank. Improving, merging or removing such pages can raise the overall quality of a site. Try: Text to HTML Ratio Checker
Title Tag
The HTML title element that names a page. It is shown in browser tabs and is the main source of the clickable title link in search results, though Google may rewrite it. A unique, descriptive title of around 50 to 60 characters is a long-standing SEO basic. Try: Google SERP Snippet Preview
TTFB (Time to First Byte)
The time between a browser requesting a page and receiving the first byte of the response, covering redirects, DNS, connection and server processing. It is not a Core Web Vital itself, but a slow TTFB delays every later metric, including Largest Contentful Paint. Around 0.8 seconds or less is considered good. Try: TTFB Checker

U

UTM Parameters
Tags added to a URL, such as utm_source, utm_medium and utm_campaign, that tell analytics tools where a visit came from. GA4 uses them to attribute traffic to campaigns and channels. Consistent lowercase naming prevents the same campaign appearing as several rows. Try: UTM Builder

W

Web Accessibility
Designing and building websites so people with disabilities can perceive, navigate and interact with them, for example with keyboard support, sufficient colour contrast, alt text and form labels. WCAG is the main international standard. Accessible sites also tend to have cleaner structure that search engines understand well. Try: Website Accessibility Checker
WebP
An image format developed by Google that supports lossy and lossless compression and transparency, usually producing smaller files than JPEG or PNG at similar quality. It is supported by all modern browsers. AVIF is a newer format that can compress even further. Try: WebP & AVIF Converter

X

x-default
A special hreflang value that identifies the page to show users whose language or region does not match any listed alternate. It usually points to a language selector or a global default page and should be included in every page's hreflang set. Try: Hreflang Tag Generator
X-Robots-Tag
An HTTP response header that carries robots directives such as noindex, nofollow or nosnippet. It works like the meta robots tag but can also apply to non-HTML files such as PDFs and images, and can be set for many URLs at once in server configuration. Try: Meta Robots & X-Robots-Tag Checker

Y

YMYL
Short for Your Money or Your Life, a term from Google's quality rater guidelines for topics that could significantly affect people's health, financial stability, safety or wellbeing. Pages on these topics are held to higher standards of expertise, accuracy and trust.

Z