Updated July 2026 · Reference
SEO Glossary: 105+ Terms, Acronyms & Definitions
This reference glossary defines 105+ terms and acronyms used in modern search. It covers technical SEO, on-page and off-page work, content, link building and analytics, plus the AI-era additions of AEO, GEO and AI Overviews. Bookmark it and refer back as you build your AI SEO strategy.
SEO Acronyms & Abbreviations
A quick-reference table of the 19 most common SEO acronyms and what they stand for. Select any row to jump to its full definition.
| Acronym | Stands For |
|---|---|
| AEO | Answer Engine Optimization |
| CLS | Cumulative Layout Shift |
| CTR | Click-Through Rate |
| CWV | Core Web Vitals |
| DA | Domain Authority |
| DR | Domain Rating |
| E-E-A-T | Experience, Expertise, Authoritativeness & Trustworthiness |
| GEO | Generative Engine Optimization |
| GSC | Google Search Console |
| INP | Interaction to Next Paint |
| JSON-LD | JavaScript Object Notation for Linked Data |
| KD | Keyword Difficulty |
| LCP | Largest Contentful Paint |
| LLM | Large Language Model |
| NAP | Name, Address, Phone |
| SERP | Search Engine Results Page |
| TF-IDF | Term Frequency–Inverse Document Frequency |
| TTFB | Time to First Byte |
| YMYL | Your Money or Your Life |
0–9
301 Redirect
An HTTP redirect status for a resource that has moved permanently. Search engines can use it as a strong canonicalization signal; update internal links and sitemaps to the destination.
Redirect Generator →302 Redirect
An HTTP redirect status for a temporary move. Choose it when the original URL is expected to return; use a permanent redirect for a permanent move.
404 Error
The HTTP status returned when a resource is not found. Removed URLs can correctly return 404, while broken internal links should be fixed for users and crawling efficiency.
410 Gone
An HTTP status indicating that a resource was intentionally removed and is unavailable. For Google Search, both 404 and 410 are valid responses for permanently removed pages.
A
AEO — Answer Engine Optimization
An industry term for making answers clear, accurate, crawlable, and sourceable. Google requires no special AEO schema for AI Overviews, and no tactic guarantees selection.
What is AEO? →Alt Text
A text alternative that communicates an image's purpose when it cannot be seen or loaded. Good alt text supports accessibility and can provide search systems with image context; decorative images usually need empty alt text.
Anchor Text
The visible text of a hyperlink. Descriptive, concise wording helps people and search systems understand the likely destination.
B
Backlink
A link from another website to yours. Links can help discovery and are among the signals Google uses, but a backlink is not a guaranteed endorsement, ranking increase, or traffic source.
Link Building Guide →Black Hat SEO
An informal label for tactics intended to manipulate search results in ways that violate a search engine's spam policies, such as cloaking or link schemes. Consequences depend on the system, severity, and review.
Bounce Rate
A web-analytics metric whose definition depends on the product. In Universal Analytics it described single-page sessions; in GA4 bounce rate is the inverse of engagement rate. Interpret it with page purpose rather than as a ranking signal.
C
Canonical Tag
A rel='canonical' link element that indicates a preferred URL among duplicate or very similar pages. Search engines treat it as a signal, not an absolute directive, and combine it with redirects, links, sitemaps, and content.
Cloaking
Presenting materially different content to search engines and users with the intent to manipulate rankings. It violates Google's spam policies and can lead to algorithmic or manual action.
CLS — Cumulative Layout Shift
A Core Web Vital measuring visual stability — how much content unexpectedly shifts while loading. Aim for a score below 0.1.
Content Decay
An informal label for declining search or business performance on an older page. Age alone does not identify the cause; investigate demand, competitors, technical changes, intent, accuracy, and measurement before updating.
Crawl Budget
For Google, the set of URLs on a hostname that Googlebot can and wants to crawl, shaped by crawl capacity and demand. Advanced optimization mainly matters for very large, rapidly changing, or discovery-constrained sites.
Crawl Budget Guide →Crawlability
How easily search-engine bots can discover and access your pages. Affected by robots.txt, internal linking, site architecture and response codes.
Crawler
An automated program that fetches web resources for a documented purpose, such as discovery, indexing, monitoring, training, or user-requested retrieval. Not every crawler feeds a search index.
CTR — Click-Through Rate
Clicks divided by impressions for a defined surface and period. Titles, snippets, position, query, brand familiarity, result features, and many other factors can affect it; no isolated change guarantees an increase.
CWV — Core Web Vitals
Metrics for loading, responsiveness, and visual stability: LCP, INP, and CLS. Google uses Core Web Vitals in its ranking systems, but good scores do not guarantee rankings and relevance remains primary.
D
DA — Domain Authority
Moz's third-party 0–100 comparative score for a domain's predicted ranking ability. It is not a Google metric; use it only with Moz's current methodology and index context.
Deindexing
Removal of a page or site from a search engine's index. It can result from an explicit directive, removal response, canonicalization, access problem, policy action, or the engine's indexing decision.
Disavow
An advanced Google Search Console tool for asking Google to ignore selected links. Google says most sites do not need it; consider it only with substantial artificial links and a manual-action risk or history, after trying removal where appropriate.
Disavow File Generator →Dofollow Link
Informal SEO wording for an ordinary link without nofollow, sponsored, or UGC relationship values. There is no rel='dofollow' attribute, and the effect of any link is determined by search systems.
DR — Domain Rating
Ahrefs' 0–100 score measuring the strength of a domain's backlink profile relative to others in its index.
Duplicate Content
Identical or substantially similar content available at multiple URLs. It is not automatically a spam violation; search engines may select a representative canonical. Consolidation, redirects, and canonical signals can reduce ambiguity.
Dwell Time
An informal measure of time between a search-result click and a return to results. It is difficult for site analytics to observe reliably and is not a published direct Google ranking metric.
E
E-E-A-T — Experience, Expertise, Authoritativeness & Trustworthiness
Concepts used in Google's search quality-rater guidelines, with trust as the central consideration. E-E-A-T is not a single ranking factor, score, or schema property; appropriate evidence depends on the topic and claim.
Entity
A distinct thing or concept that can be identified across references, such as a person, organization, place, or product. Search systems can use entity relationships, but there is no universal entity-clarity score or guaranteed AI-search effect.
What is Entity SEO? →Evergreen Content
Content intended to remain useful beyond a short news cycle. It may still need updates as facts, products, laws, links, or audience needs change, and it is not guaranteed steady traffic.
External Link
A link from one site to a different domain. Use it when the destination helps readers verify a source, complete a task, or get necessary context; it is not a generic trust boost.
F
Featured Snippet
A Google Search feature that can show an extracted or summarized answer with a source link. Selection and format are determined by Google; concise paragraphs, lists, or tables create no guarantee.
G
GEO — Generative Engine Optimization
An industry label for work around how information is available and represented in generative answer products. It overlaps with useful content, technical access, public facts, and scoped measurement; no tactic guarantees a citation.
GEO Guide →Google AI Overview
A generative feature that Google may show within Search, with supporting links and formats that vary by query and interface. Ordinary Search eligibility and SEO guidance apply; there is no special AEO markup requirement.
How AI Overviews Work →Googlebot
Google's crawler for products including Google Search. Google publishes desktop and smartphone user-agent details; site owners should verify access and rendering with current Search Console and crawler documentation.
GSC — Google Search Console
Google's service for site owners to review Search performance and selected crawling, indexing, enhancement, and security information. Reports are sampled, aggregated, and scoped to the verified property.
H
H1 Tag
An HTML level-one heading. Use it to describe the page's main subject for readers; a page can technically contain more than one, and there is no primary-keyword placement rule.
Hreflang
An annotation linking language or regional variants of a page. Google requires supported codes, self-references, and return links for the variants it evaluates; invalid or incomplete annotations may be ignored.
Hreflang Generator →HTTPS
HTTP transported over TLS encryption, helping protect data in transit and authenticate the server. Google has described HTTPS as a lightweight ranking signal, but it does not prove that a site or its content is trustworthy.
I
Indexation
The process of a search engine adding a page to its index. Only indexed pages can appear in search results.
INP — Interaction to Next Paint
A Core Web Vital measuring responsiveness — the delay between a user interaction and the next visual update. It replaced FID in 2024; aim below 200 ms.
Internal Link
A link between pages on the same site. Crawlable, descriptive internal links help people navigate and help search systems discover pages and understand context.
J
JSON-LD — JavaScript Object Notation for Linked Data
A linked-data serialization often embedded in a script element in a page's head or body. Google recommends JSON-LD for supported structured-data features when practical.
Schema Generator →K
KD — Keyword Difficulty
A vendor-defined competitiveness estimate, often on a 0–100 scale. Inputs differ by tool and may emphasize links to current results; KD is not a Google metric or a ranking probability.
Keyword
In SEO, a word or phrase used to describe or research search demand. A keyword-tool entry is not necessarily the exact query a person used or a requirement to create a page.
Keyword Cannibalization
An informal diagnosis for multiple pages with overlapping intent when that overlap causes unstable targeting or inefficient maintenance. Multiple pages appearing for related queries are not automatically a problem; consolidate or differentiate only after reviewing evidence.
Keyword Density
How often a keyword appears relative to total word count. There is no ideal ratio — write naturally and avoid stuffing.
Keyword Density Checker →Keyword Research
Collecting and interpreting search queries and estimates to understand audience language, demand, intent, and current results. It informs page decisions but does not prescribe content volume.
Keyword Research Guide →Keyword Stuffing
Repeating terms unnaturally in an attempt to manipulate rankings. Google lists keyword stuffing as a spam practice; write for clear meaning rather than a density target.
Knowledge Panel
An information panel Google may show for an entity, assembled from sources across the web and Google's systems. Eligible entities can claim or suggest edits in supported cases, but display is not earned through a fixed signal checklist.
L
Landing Page
Any page where a visitor arrives from an external source. In SEO, the page that ranks and receives organic clicks for a query.
LCP — Largest Contentful Paint
A Core Web Vital measuring loading speed — when the largest visible element renders. Aim for under 2.5 seconds.
Link Building
Work intended to earn useful references from other sites, including digital PR, primary resources, and editorial contributions. Links remain publisher decisions and do not guarantee authority, rankings, or traffic.
Link Building Guide →Link Equity
An informal SEO concept for ranking signals associated with links. It is not a directly observable unit, and search engines do not publish a fixed value based on authority, relevance, or position.
LLM — Large Language Model
A model trained to predict and generate language from large datasets. Products may combine an LLM with retrieval, tools, policies, and other models; product behavior cannot be inferred from the LLM label alone.
llms.txt
A proposed Markdown file for curated site context. Applications may ignore it; Google Search says it does not use the file and it is not an AI sitemap or ranking signal.
llms.txt Guide →Local SEO
Improving a business's eligibility and usefulness in location-based search, including accurate Business Profile information, suitable local pages, reviews, and consistent contact details where relevant.
What is Local SEO? →Long-Tail Keyword
An informal label for more specific or less frequent search demand. It is not defined by a three-word minimum, and a long query is not automatically lower competition or higher converting.
M
Meta Description
A page-level summary that search engines may use when generating a result snippet. Google publishes no fixed length and may select other page text; write an accurate, useful summary rather than promising a CTR effect.
Meta Tag Generator →Meta Robots Tag
Page-level instructions for compliant crawlers, including noindex and snippet controls. A nofollow value concerns links on the page; robots.txt and authentication handle access at other layers.
Meta Title
Informal wording for the HTML title element, which appears in browser tabs and can contribute to a search-result title link. Make it descriptive and concise; Google publishes no fixed 60-character limit or keyword-position rule.
Mobile-First Indexing
Google's use of the content crawled with its smartphone crawler for indexing. Important content, metadata, structured data, and links should be equivalent and accessible on mobile.
N
NAP — Name, Address, Phone
Core business contact details often maintained across a site, Google Business Profile, and relevant directories. Accuracy helps customers and platforms, but consistency is not a standalone local-ranking formula.
Negative SEO
An informal label for attempts to damage another site's search performance. Google says its systems generally handle ordinary spammy links; investigate evidence before assuming a ranking change was caused by an attack.
Nofollow
A link relationship value that tells search systems the publisher does not want to imply an ordinary association. Google treats nofollow as a hint; use sponsored for paid links and UGC for user-generated links when appropriate.
Noindex
A robots directive asking compliant search engines not to include a page in their index. The crawler must be allowed to fetch the directive, and access control is still required for private material.
O
Off-Page SEO
Relevant activity beyond your pages, including editorial links, digital PR, reputation, reviews and accurate local citations.
What is Off-Page SEO? →On-Page SEO
Optimizing elements on the page itself — content, titles, headings, internal links, structured data and UX.
What is On-Page SEO? →Organic Traffic
Visits attributed to unpaid search results under an analytics system's channel rules. More traffic is not always the objective; qualified outcomes, accuracy, and user needs may matter more.
Orphan Page
A page with no internal links pointing to it, making it hard for crawlers and users to find. Fixed by adding contextual internal links.
Outbound Link
A link from a page to a different website. Use outbound links when they let readers verify a claim, access a primary source, or continue a task; they are not a generic ranking or trust signal.
P
Page Experience
How usable and satisfying a page is across multiple aspects. Google has no single page-experience signal; Core Web Vitals are used by ranking systems, while relevance and useful content remain primary.
PageRank
Google's link-analysis system, originally described as estimating page importance from the web's link structure. Google still lists PageRank among its core ranking systems, but it does not expose a public page-level score.
Pillar Page
An editorial term for a broad hub that introduces a subject and links to useful related pages. It is optional, and its scope should follow audience needs rather than a fixed cluster formula.
Pogo-Sticking
Informal SEO wording for returning to search results soon after clicking a result. A site cannot reliably infer the full search journey from its analytics, and Google publishes no direct pogo-sticking ranking formula.
Programmatic SEO
Using templates and structured data to publish many pages from a repeatable system, often for products, locations, or directories. Scale is not inherently useful; pages still need accurate data, distinct value, controls, and review to avoid scaled-content abuse.
What is Programmatic SEO? →Q
Query
The exact words a user enters into a search engine. Modern SEO targets the intent behind queries, not just literal strings.
R
Rank Tracking
Sampling a site's search-result position for defined queries, locations, devices, and dates. Mentions or links in generative responses are a separate observation, not a stable numbered rank.
AI Mode Rank Tracking →RankBrain
A machine-learning component of Google's algorithm that helps interpret novel and ambiguous queries by understanding intent.
Rich Results
Search-result presentations that add supported visual or interactive features beyond a standard result. Valid structured data can create eligibility for some types, but Google decides whether to display them; FAQ rich results have narrow availability.
Robots.txt
A file at a site's root containing crawl rules for compliant user agents. It is not access control and does not guarantee deindexing; apply separate rules for provider agents only after reviewing their current documentation.
Robots.txt Generator →S
Schema Markup
Structured data using a vocabulary such as schema.org. For supported Google features, accurate markup matching visible content can create eligibility, not a ranking or rich-result guarantee; Google recommends JSON-LD when practical.
Schema Generator →Search Intent
The task or need behind a query. Labels such as informational, commercial, transactional, and navigational are planning aids rather than a complete Google taxonomy or a ranking guarantee.
Semantic SEO
Optimizing around topics, entities and relationships rather than isolated keywords, so a page comprehensively covers a subject.
What is Semantic SEO? →SERP — Search Engine Results Page
Everything shown for a query: organic results, ads, featured snippets, AI Overviews and other features.
SERP Preview Tool →SERP Features
Non-standard result types beyond the classic blue links — snippets, People Also Ask, image packs, knowledge panels and AI Overviews.
Sitemap (XML)
An XML file listing a site's important URLs to help search engines discover and crawl them. Submitted in Search Console.
Sitemap Generator →Speakable Schema
A beta structured-data feature Google documents for eligible news content and text-to-speech use. It is not a general AEO requirement or citation signal.
Status Code
The HTTP response a server returns for a request — 200 (OK), 301/302 (redirects), 404 (not found), 5xx (server error). Key signals for crawlers.
Structured Data
Machine-readable data that describes entities and relationships on a page, often using schema.org vocabulary. Search-engine support is feature-specific and requires accurate correspondence with visible content.
T
Technical SEO
Optimizing crawling, indexing, speed, structure and security so search engines can access and render a site efficiently.
Technical SEO Checklist →TF-IDF — Term Frequency–Inverse Document Frequency
A statistical weighting that compares a term's frequency in a document with its frequency across a corpus. SEO tools may use it diagnostically, but it is not a Google content-coverage or ranking requirement.
Thin Content
Informal wording for a page that offers too little useful value for its purpose. Word count alone does not determine quality; assess accuracy, originality, task completion, duplication, and why the page exists.
Topic Cluster
An editorial organization of related pages connected with useful internal links. A hub-and-supporting-page pattern is optional; page count and architecture should follow distinct audience tasks.
Topic Clustering →TTFB — Time to First Byte
The time from requesting a resource until the first response byte arrives. TTFB can influence loading performance and LCP, but network, caching, rendering, and page resources also matter.
U
URL Slug
The path segment identifying a resource, such as /seo-glossary. Human-readable, stable wording can help users understand a link; slug length and keyword placement are not ranking formulas.
UX Metrics
Measurements such as task completion, engagement, and usability that help a team improve a page. Analytics metrics such as bounce rate are not a published direct Google ranking formula.
V
Voice Search
Submitting a spoken query through a phone, speaker, car, or assistant. The available result and response format depend on the provider, device, query, and current product behavior.
W
White Hat SEO
An informal label for SEO work that follows search-engine policies and prioritizes users, such as useful content, sound technical implementation, and editorial link earning. Compliance does not guarantee durable rankings.
Y
YMYL — Your Money or Your Life
Google quality-rater terminology for topics that can significantly affect health, finances, safety, or society. Strong accuracy and trust evidence are especially important.
Z
Zero-Click Search
An analytics or research label for a search session with no recorded click to an external website. The reason may be an on-result answer, a reformulated query, an app action, or abandonment; no click does not prove the need was resolved.
What is Zero-Click Search? →Continue Learning
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