Glossary

SEO, AEO & GEO glossary

Plain-language definitions for every term in modern search — the kind AI engines like to cite.

AllGEOAEOAI SearchTechnical SEOContent Automation
ABCDEFGHIKLMNPQRSTVWZ· jump to letter

A

AEO

AEO vs SEO

AEO vs SEO compares two optimization approaches: SEO aims to rank pages high in link-based search results, while AEO structures content so answer engines like ChatGPT and AI Overviews extract and cite it directly in synthesized responses.

GEO

AI Citations

AI citations are the sources an AI engine references or links to when composing a generated answer, marking which brands and pages a model trusts enough to credit inside responses from ChatGPT, Gemini, Perplexity, and AI Overviews.

GEO

AI Overview

An AI Overview is an AI-generated summary Google displays at the top of search results, synthesizing information from multiple web sources to answer a query directly and citing the pages it draws from, above the traditional list of blue links.

AI Search

AI Overviews vs Featured Snippets

AI Overviews vs featured snippets contrasts two Google answer formats: a featured snippet extracts a passage verbatim from one ranking page, while an AI Overview synthesizes a generated answer from multiple sources and may cite several at once.

AI Search

AI Search Engine

An AI search engine is a system that answers queries with synthesized, conversational responses drawn from retrieved sources, often citing them inline, rather than returning only a ranked list of blue links.

AI Search

AI Search Monitoring

AI search monitoring is the practice of tracking how and where a brand appears inside AI answer engines — which queries cite it, which mention it by name, and how that presence shifts across engines and over time.

AI Search

AI Search Ranking

AI search ranking is how prominently a brand or page surfaces inside AI-generated answers—whether it is named, how central it is to the answer, and whether its own page is cited—rather than a numbered position on a traditional results page.

AI Search

AI Search Visibility

AI search visibility is the degree to which a brand, page, or product appears and is cited within AI-generated answers across engines like Google AI Overviews, ChatGPT, Perplexity, and Gemini, rather than only in traditional search rankings.

Technical SEO

Alt Text

Alt text is the alt attribute added to an image in HTML that describes the image in words, supporting screen-reader accessibility and helping search engines and AI understand what the image depicts.

AEO

Answer Engine

An answer engine is a search system that returns a direct, synthesized answer to a query rather than a ranked list of links, drawing on sources like web pages, structured data, and large language models to respond conversationally.

AEO

Answer Engine Optimization

Answer Engine Optimization (AEO) is the practice of structuring and writing content so AI-powered answer engines—such as ChatGPT, Perplexity, Google AI Overviews, and voice assistants—can extract, trust, and cite it directly when answering user questions.

B

GEO

Brand Mentions in AI

Brand mentions in AI are the instances where an AI engine names a brand inside a generated answer, whether linked or unlinked, signaling that the model recognizes and trusts that brand enough to surface it in responses.

C

Technical SEO

Canonical Tag

A canonical tag is the rel="canonical" link element placed in a page's HTML that tells search engines which URL is the preferred, authoritative version among duplicate or near-duplicate pages so ranking signals consolidate there.

Technical SEO

Canonicalization

Canonicalization is the process of choosing and signaling the single preferred URL among duplicate or near-duplicate pages so search engines consolidate ranking signals onto one authoritative version instead of splitting them.

AI Search

ChatGPT Search

ChatGPT Search is OpenAI's feature, launched in late October 2024, that adds live web retrieval and source links to ChatGPT, letting it answer current questions with grounded, conversational responses instead of relying only on trained knowledge.

Content Automation

Content Pruning

Content pruning is the deliberate process of removing, consolidating, or improving low-value, outdated, or redundant pages so that a site's remaining content is stronger, more relevant, and more efficiently crawled.

AEO

Conversational Search

Conversational search lets users query in natural, full-sentence language and ask follow-up questions that keep context, with the engine interpreting intent across the dialogue and returning synthesized answers rather than a static list of keyword-matched links.

Technical SEO

Core Web Vitals

Core Web Vitals are a set of user-experience metrics — Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness), and Cumulative Layout Shift (visual stability) — used to gauge how a page performs for real users.

Technical SEO

Crawl Budget

Crawl budget is the amount of crawling a search engine will do on a site in a given timeframe, shaped by how much the server can handle (crawl capacity) and how much the engine wants to crawl (crawl demand).

D

Content Automation

Domain Authority

Domain Authority (DA) is a third-party metric from Moz scored 0–100 that predicts how well a website may rank; it is not a Google ranking factor but a comparative estimate of relative ranking strength.

Content Automation

Domain Rating (DR)

Domain Rating (DR) is Ahrefs' third-party metric, on a 0–100 scale, that estimates the strength of a website's backlink profile relative to other sites; it is a vendor's comparative estimate, not a metric Google calculates or uses to rank pages.

Content Automation

Domain Rating vs Domain Authority

Domain Rating vs Domain Authority compares two third-party 0–100 scores that estimate a site's ranking strength—Ahrefs' Domain Rating, based mainly on backlink profile, and Moz's Domain Authority, a broader machine-learned ranking prediction—neither of which is used by Google.

E

Content Automation

E-E-A-T

E-E-A-T stands for Experience, Expertise, Authoritativeness, and Trustworthiness, a conceptual quality framework in Google's Search Quality Rater Guidelines used to assess content credibility, not a direct numeric ranking score.

Content Automation

Entity SEO

Entity SEO is the practice of optimizing content around distinct, identifiable things such as people, places, organizations, products, and concepts that search engines recognize and connect in knowledge graphs, rather than around keyword strings.

F

AEO

Featured Snippet

A featured snippet is a highlighted answer box Google displays at the top of search results, sometimes called position zero, that extracts a concise answer from a ranking page to respond to a query directly on the results page.

G

AI Search

Gemini Search

Gemini Search refers to search and answer experiences powered by Gemini, Google's AI model family (rebranded from Bard in February 2024), which generate conversational, synthesized responses drawn from across the web rather than only ranked links.

GEO

Generative AI Search

Generative AI search is search powered by large language models that returns a synthesized, conversational answer to a query, often citing sources, instead of presenting a ranked list of links for the user to click.

GEO

Generative Engine Optimization

Generative Engine Optimization (GEO) is the practice of structuring content so it gets cited inside generative search results and AI overviews — the answers assistants produce instead of a list of links.

GEO

GEO vs SEO

GEO vs SEO is the comparison between Generative Engine Optimization, which earns citations inside AI-generated answers, and traditional SEO, which earns blue-link rankings on search engine results pages.

AI Search

Google AI Mode

Google AI Mode is a conversational AI search experience from Google that lets users ask complex, multi-part questions and receive synthesized answers with follow-ups, going beyond the inline summaries of AI Overviews.

GEO

Google SGE (Search Generative Experience)

Google SGE (Search Generative Experience) was Google's experimental AI-generated search feature announced at Google I/O in May 2023, placing a synthesized answer above traditional results; it later evolved into AI Overviews.

H

Technical SEO

Hreflang

Hreflang is an HTML link attribute (rel="alternate" hreflang) that tells search engines the language and optional regional targeting of a page, helping them serve the correct localized version to the right audience.

I

Technical SEO

Index Coverage

Index coverage describes which of a site's pages a search engine has crawled and included in its index, where they become eligible to appear in results; pages excluded from the index cannot rank or be cited.

K

Content Automation

Keyword Density

Keyword density is the proportion of times a target term appears relative to the total word count of a page; there is no official optimal percentage, and modern SEO favors natural language over hitting a density target.

Content Automation

Keyword Gap

A keyword gap is the set of search queries your competitors rank for but you do not, revealing missed opportunities where relevant demand exists and your content is absent or underperforming.

L

GEO

LLM Visibility

LLM visibility is how prominently and often a brand, page, or entity appears inside the answers produced by large language model engines like ChatGPT, Gemini, and Perplexity, whether through direct citations or unlinked mentions.

Technical SEO

llms.txt

llms.txt is a proposed standard—a Markdown file placed at a website's root (/llms.txt) that gives large language models a curated, clean map of the site's most important content, helping them find and use that information accurately at inference time.

Content Automation

Long-Tail Keywords

Long-tail keywords are longer, more specific search queries that individually attract lower search volume but carry clearer intent, typically facing less competition and converting better than broad head terms.

M

Technical SEO

Meta Description

The meta description is an HTML meta tag that summarizes a page's content; search engines often use it as the snippet beneath a result, where it influences click-through even though it is not a direct ranking factor.

Technical SEO

Meta Title

The meta title, or title tag, is the HTML element that defines a page's title, shown in browser tabs and often used as the clickable headline in search results, influencing relevance signals and click-through.

N

Technical SEO

Nofollow vs Dofollow Links

Dofollow links are ordinary links that can pass ranking signals, while nofollow links carry a rel="nofollow" attribute telling search engines not to pass those signals; since 2019 Google treats nofollow as a hint rather than a strict directive.

P

AEO

People Also Ask (PAA)

People Also Ask (PAA) is a Google search results feature that displays a set of expandable related questions, each revealing a short extracted answer and source link when clicked, helping users explore a topic and surfacing follow-up queries.

AI Search

Perplexity vs ChatGPT

Perplexity vs ChatGPT compares two leading AI answer engines: Perplexity is built around inline source citations for research-style queries, while ChatGPT is a conversational assistant whose Search mode adds web grounding and links.

Content Automation

Programmatic SEO

Programmatic SEO is the practice of producing many web pages from a single template combined with a structured data source, so that each page targets a specific variation of a large, repeatable set of search queries.

AI Search

Prompt Tracking

Prompt tracking is the practice of running a defined set of prompts—the questions buyers ask AI engines—on a schedule and recording what the answers say about a brand: whether it is named, how it is described, and whether its pages are cited across engines.

Q

GEO

Query Fan-Out

Query fan-out is how AI search systems like Google's AI Mode break a single user query into multiple related sub-queries, run them in parallel, and synthesize the results into one answer that can cite many different sources.

AEO

Question Keywords

Question keywords are search queries phrased as natural-language questions, typically beginning with who, what, where, when, why, or how, that signal informational intent and are central to winning featured snippets, People Also Ask, and AI citations.

R

AI Search

Retrieval-Augmented Generation (RAG)

Retrieval-Augmented Generation (RAG) is a technique that grounds a language model's output in documents retrieved at query time, conditioning the generated answer on real sources to reduce hallucination and keep responses current.

Technical SEO

robots.txt

robots.txt is a text file at a site's root, part of the Robots Exclusion Protocol, that tells web crawlers which URLs they may or may not request, guiding crawl behavior without guaranteeing pages stay out of the index.

S

Technical SEO

Schema Markup

Schema markup is structured data built on the Schema.org vocabulary, usually written in JSON-LD, that labels page elements like products, articles, and FAQs so search engines and AI can understand and present them as rich results.

Content Automation

Search Intent

Search intent is the underlying goal a person has when entering a query, commonly grouped as informational, navigational, commercial, or transactional, and matching content to that goal is central to ranking and conversion.

Content Automation

Semantic SEO

Semantic SEO is the practice of optimizing content around topics, entities, and the relationships between concepts so search engines understand meaning and context, rather than targeting exact-match keywords in isolation.

GEO

SEO vs GEO

SEO vs GEO is the comparison between traditional search engine optimization, which earns ranked links on results pages, and Generative Engine Optimization, which earns citations inside AI-generated answers from engines like ChatGPT and Google AI Overviews.

Technical SEO

Sitemap XML

A sitemap XML is a structured file, following the sitemaps.org protocol, that lists the URLs on a website so search engines and AI crawlers can discover, prioritize, and index content more efficiently.

Technical SEO

Structured Data

Structured data is machine-readable markup, commonly using Schema.org vocabulary in JSON-LD, that describes a page's content to search engines and AI so they can understand entities, relationships, and context and power rich results.

T

Content Automation

TF-IDF

TF-IDF (Term Frequency–Inverse Document Frequency) is a classic information-retrieval weighting that scores how distinctive a term is to a document relative to a larger corpus, balancing how often a term appears against how common it is overall.

Content Automation

Thin Content

Thin content is low-value web content that gives users little or no original substance—such as auto-generated pages, doorway pages, scraped copy, or shallow rewrites—that search engines may filter, demote, or penalize under their quality policies.

Content Automation

Topical Authority

Topical authority is the degree to which a website is recognized as a comprehensive, credible source on a subject, earned by covering a topic deeply and consistently across many interconnected pages.

V

AEO

Voice Search Optimization

Voice search optimization is the practice of structuring content so voice assistants like Siri, Alexa, and Google Assistant can find and read it aloud, favoring concise, conversational, question-based answers since assistants usually return a single spoken result.

W

GEO

What Does GEO Stand For

GEO stands for Generative Engine Optimization, the practice of optimizing content so it gets retrieved, trusted, and cited inside AI-generated answers from engines like ChatGPT, Perplexity, Gemini, and Google AI Overviews.

Content Automation

White Hat vs Black Hat SEO

White hat SEO refers to policy-compliant tactics that align with search engine guidelines and build durable value, while black hat SEO refers to manipulative tactics that violate those guidelines and risk penalties.

Z

AEO

Zero-Click Search

A zero-click search is a query that gets resolved directly on the search results page, with the answer shown in a snippet, AI Overview, or knowledge panel, so the user finds what they need without clicking through to any website.