shareof.ai
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A practical resource
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The oracle's index

AI search, without
the fog.

The terms behind AI visibility, GEO, citations, crawlers, and answer engines. Written for people doing the work.

56plain-English
definitions
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AI visibility

How often and how prominently a brand appears in answers from AI systems.

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Answer engine optimization (AEO)

Improving content so answer engines can understand, trust, and use it.

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Generative engine optimization (GEO)

The practice of improving a brand's presence in generative AI answers.

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Share of AI

A brand's portion of relevant AI answers or recommendations within a tracked market.

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Prompt monitoring

Repeatedly running important prompts to observe how AI answers change.

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Prompt library

A structured set of questions used to measure buyer journeys in AI search.

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Brand mention

An explicit reference to a brand, product, or domain in an AI answer.

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Mention rate

The percentage of tracked answers that mention a brand.

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Recommendation rate

The percentage of answers that actively recommend a brand.

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Answer position

Where a brand appears within an ordered AI response.

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Competitive visibility

A comparison of brand presence across the companies competing for the same answers.

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Competitive gap

A prompt, topic, or source where competitors appear and the tracked brand does not.

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Source gap

A cited page or domain that supports competitors but omits the tracked brand.

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AI citation

A source page linked or attributed within an AI-generated answer.

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Citation frequency

How often a page or domain is cited across a monitored answer set.

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Citation diversity

The breadth of independent domains and page types supporting an answer or brand.

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Source authority

The perceived credibility and influence of a source used in AI answers.

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Model coverage

The range of AI models in which a brand or finding appears.

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Cross-model consistency

How similar a brand's visibility or positioning is across different AI systems.

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Answer volatility

How much an AI answer changes between repeated runs or over time.

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AI answer sentiment

The positive, neutral, mixed, or negative framing of a brand in an answer.

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Entity

A distinct person, organization, product, place, or concept understood as one thing.

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Entity resolution

Matching different names, domains, and references to the same real-world entity.

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Entity authority

The accumulated trust and prominence associated with an entity in a topic.

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Knowledge graph

A network of entities and the relationships between them.

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Structured data

Machine-readable markup that describes a page's entities and content.

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Schema.org

A shared vocabulary for describing structured information on web pages.

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JSON-LD

A JSON-based format commonly used to add linked structured data to a page.

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Retrieval-augmented generation (RAG)

Generating an answer with information retrieved from external sources.

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Grounding

Connecting an AI answer to specific evidence or trusted data.

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AI hallucination

A confident output that is unsupported, fabricated, or factually incorrect.

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Claim accuracy

How closely statements in AI answers match verifiable facts.

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Information freshness

How current the facts and sources used in an AI answer are.

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llms.txt

A proposed plain-text file that helps AI systems find a site's most useful content.

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robots.txt

A root-level file that communicates crawl permissions to compliant bots.

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AI crawler

An automated user agent that retrieves web content for an AI-related service.

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AI crawler analytics

Measurement of confirmed AI-bot visits to a website.

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Server log analysis

Reviewing web-server request logs to understand crawler and visitor behavior.

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XML sitemap

A machine-readable list of canonical URLs a site wants crawlers to discover.

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Indexability

Whether a page is technically eligible to be added to a search or retrieval index.

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Canonical URL

The preferred URL for a page when duplicate or similar versions exist.

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Content gap

A useful topic, question, or proof point that a site does not adequately cover.

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Information gain

Useful new value a page adds beyond what existing sources already say.

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Primary research

Original evidence collected or produced directly by an organization.

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Topical authority

Demonstrated depth, consistency, and credibility across a subject area.

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Content cluster

A group of related pages organized around a broader subject.

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Vector search

Retrieving content by mathematical similarity between semantic representations.

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Embedding

A numeric representation of text, images, or other data used to compare meaning.

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