SEO Reference

Complete SEO Glossary

Every SEO term, definition, and concept explained clearly. Updated for 2026.

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A6 terms
Algorithm

A set of rules search engines use to rank websites.

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Algorithm Update

A change Google makes to its search ranking systems.

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Alt Text

Text that describes an image for search engines and users who cannot see it.

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Anchor Text

The clickable text in a hyperlink.

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Authority

A measure of how trustworthy a site is in Google's eyes.

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Alt Text (Alternative Text)

Text that describes an image for accessibility and search engines.

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B5 terms
Backlink

A link from one website to another.

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Bounce Rate

Percentage of visitors who leave after viewing one page.

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Breadcrumbs

Navigation links showing where a page sits within a website hierarchy.

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Broken Link

A hyperlink that leads to a non-existent page.

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Black-Hat SEO

SEO tactics that violate search engine guidelines.

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C10 terms
Canonical Tag

An HTML tag that identifies the preferred version of a page.

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Canonical URL

The preferred URL when multiple pages have similar content.

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Click-Through Rate (CTR)

Percentage of people who click your result in search.

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Content Gap

Topics your competitors cover that your website does not.

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Core Web Vitals

Google's metrics measuring page experience quality.

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Crawl Budget

How many pages Google crawls on your site per day.

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Crawlability

How easily search engine crawlers can access and navigate a website.

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Customer Experience Transformation

Improving the entire customer journey to increase trust and conversion.

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Crawling

The process search engines use to discover pages on the web.

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CTR (Click-Through Rate)

The percentage of people who click a listing after seeing it.

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D7 terms
Domain Authority (DA)

Moz's score predicting how likely a domain is to rank.

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Domain Rating (DR)

Ahrefs' measure of backlink profile strength.

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Duplicate Content

Identical or very similar content across multiple URLs.

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Dofollow

The default link attribute that allows link equity to pass.

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Dwell Time

How long a user stays on a page before returning to search results.

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Domain Rating (DR)

Ahrefs metric for the strength of a site’s backlink profile.

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Domain Authority (DA)

Moz metric estimating a domain’s ability to rank.

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E5 terms
E-E-A-T

Experience, Expertise, Authoritativeness, Trustworthiness.

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Entity SEO

Optimizing your brand as a recognized entity in Google's Knowledge Graph.

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Engagement Rate

How actively users interact with your content or ads.

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Evergreen Content

Content that remains relevant and useful for a long time.

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External Link

A hyperlink pointing from your website to another website.

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F3 terms
Featured Snippet

A search result displayed above organic results in a box.

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Focus Keyword

The main keyword a page is trying to rank for.

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Follow Link

A standard hyperlink that passes authority to the destination page.

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G3 terms
Google Analytics

Google's free web analytics platform.

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Google Search Console

Google's free tool for monitoring search performance.

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Guest Blogging

Writing articles published on another website.

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H5 terms
HTML (HyperText Markup Language)

The standard markup language for creating web pages.

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Hreflang

An HTML attribute telling Google which language a page targets.

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H1 Tag

The main heading tag used to describe a page topic.

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HTTPS

A secure version of HTTP that encrypts data between browser and server.

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HTTPS (HyperText Transfer Protocol Secure)

The secure protocol used to encrypt web traffic.

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I5 terms
Index

Google's database of all web pages it has crawled.

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Indexability

Whether a webpage can be added to a search engine's index.

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Internal Link

A link from one page on a site to another page on the same site.

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Internal Linking

The practice of linking pages within the same website.

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Indexing

The process of adding a page to a search engine index.

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J1 term
JavaScript

A programming language often used to power interactive website features.

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K7 terms
Keyword

A word or phrase users type into search engines.

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Keyword Cannibalization

When multiple pages on a website compete for the same search query.

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Keyword Density

How often a keyword appears relative to total content length.

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Keyword Difficulty

How hard it is to rank for a keyword in organic search.

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Keyword Intent

The goal behind a search query from the user's perspective.

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Keyword Research

The process of finding what your audience searches for.

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Keyword Stuffing

Overusing keywords in content in an unnatural way.

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L7 terms
Link Building

The process of acquiring backlinks from other websites.

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Link Equity (PageRank)

The value and authority passed through hyperlinks.

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Local SEO

Optimizing your online presence for local search results.

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Long-Tail Keywords

Longer, more specific keyword phrases with lower search volume.

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Landing Page

A page designed to convert visitors into leads or sales.

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Long-Tail Keyword

A more specific search phrase with lower volume but higher intent.

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Link Juice

The authority or value passed through a hyperlink.

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M5 terms
Meta Description

HTML summary of a page displayed in search results.

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Meta Title (Title Tag)

The HTML title of a page shown in search results.

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Mobile-First Indexing

Google primarily uses the mobile version of a site for indexing and ranking.

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Metadata

Structured information about a page used by browsers and search engines.

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Mobile Optimization

Making a website work well on smartphones and tablets.

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N5 terms
Nofollow

A link attribute telling search engines not to pass authority.

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Noindex

A directive telling search engines not to index a page.

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Negative SEO

Malicious tactics used to hurt a competitor’s rankings.

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Nofollow Link

A link that tells crawlers not to pass authority.

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NAP (Name, Address, Phone)

Business contact details that should be consistent across the web.

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O3 terms
On-Page SEO

Optimization of individual web pages for search engines.

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Organic Traffic

Visitors from unpaid search engine results.

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Off-Page SEO

SEO activities that happen away from your website.

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P6 terms
Page Speed

How fast a webpage loads for users.

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Pillar Page

A comprehensive guide covering a broad topic in depth.

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PageRank

Google’s historic link-based ranking algorithm concept.

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PageRank

Google’s historic link-based ranking algorithm concept.

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Penalty

A search ranking drop caused by violating search engine guidelines.

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PPC (Pay-Per-Click)

Paid advertising model where advertisers pay for each click.

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Q3 terms
Quality Content

Useful, original, and relevant content that satisfies search intent.

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Query

The search term someone enters into a search engine.

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Quick Answer Box

A short answer format shown at the top of search results.

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R4 terms
Redirect

A technique to send users and bots from one URL to another.

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Robots.txt

A file that tells search engines which pages not to crawl.

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Rich Snippet

A search result enhanced with additional informative elements.

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ROI (Return on Investment)

A measure of how much value SEO generates compared to its cost.

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S11 terms
Schema Markup

Structured data code that helps search engines understand content.

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Search Intent

The reason behind a user's search query.

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SEO Audit

A review of a website's technical, on-page, and off-page SEO issues.

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SEO Strategy

A plan for improving a website's visibility and rankings over time.

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SERP

Search Engine Results Page the page shown after a search.

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Sitemap

A file listing all pages on a site to help search engines crawl.

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Sandbox

A theory that new websites take time before ranking strongly.

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Search Engine Results Page (SERP)

The page that shows results for a search query.

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SSL Certificate

A digital certificate that enables HTTPS encryption.

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SERP (Search Engine Results Page)

The page that shows results after a search query.

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Search Intent

The purpose behind a user’s query.

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T5 terms
Technical SEO

Optimization of website infrastructure for search engines.

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Thin Content

Low-value pages that add little useful information for users.

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Title Tag

The HTML title shown in browser tabs and search results.

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Topical Authority

Being recognized as an expert on a specific topic area.

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Traffic

The visitors that come to a website from different channels.

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U7 terms
URL Structure

The way a website organizes URLs and paths.

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User Experience (UX)

How users interact with and feel about a website.

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URL (Uniform Resource Locator)

The address used to locate a web page on the internet.

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User-Generated Content (UGC)

Content created by customers or users rather than the brand.

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User Experience (UX)

How a person feels when using a website or product.

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User-Generated Content (UGC)

Content created by users, customers, or community members.

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UX

A shorthand for user experience.

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V3 terms
Visibility

How often and how prominently a site appears in search results.

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Voice Search

Search queries spoken to a device or assistant instead of typed.

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Video SEO

Optimizing video content to rank in search and video platforms.

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W4 terms
White-Hat SEO

SEO practices that comply with search engine guidelines.

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Webmaster Tools

Tools used to monitor site health and search performance.

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Website Architecture

How a site’s pages and content are structured and linked.

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What is robots.txt?

A root-level file that tells crawlers what they can access.

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X2 terms
XML Sitemap

A structured list of website URLs for search engines.

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X-Robots-Tag

An HTTP response header used to control indexing and crawling directives.

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Y2 terms
Yoast SEO

A popular WordPress plugin for technical and on-page SEO optimization.

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YMYL (Your Money or Your Life)

Pages that can affect a person’s financial stability, health, or safety.

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Z2 terms
Z-Index

A CSS stacking property for layered elements on a page.

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Zero-Click Search

A search result that answers the user’s question without a click.

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