Concept Hallucination
AI hallucination
An AI hallucination is when a language model states a false or unverifiable claim with high confidence — inventing…
The AI Search Glossary
Plain-English, citable definitions for the vocabulary of AI search — GEO, AEO, AI visibility, and answer engines. Every term carries how it behaves across Asian markets, measured with Quratic's residential-IP collection network in Singapore, Japan, Korea, Malaysia, Indonesia, and Hong Kong.
30 terms defined
How we define terms →
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ConceptAI Overview
An AI Overview is a Google Search feature that displays an AI-generated summary above traditional organic results,…
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MetricAI sentiment
AI sentiment is how positively, neutrally, or negatively a brand is described inside AI-generated answers — tone,…
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ConceptAI SERP
An AI SERP is a search results experience where generative AI components — summaries, follow-up prompts, cited sources…
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MetricAI Visibility Score
An AI Visibility Score is a single 0–100 measure of how present a brand is in AI-generated answers, combining how often…
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ConceptAnswer engine
An answer engine is any system that responds to an information need with a direct, synthesized answer rather than only…
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Strategy AEOAnswer Engine Optimization (AEO)
Answer Engine Optimization (AEO) is the page-level discipline of formatting content so answer engines can extract a…
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TechnicalBrand entity
A brand entity is a machine-resolvable representation of a company or product — name, type, identifiers, and sameAs…
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MetricCitation rate
Citation rate is the percentage of tracked AI answers that include a link or attributed reference to a domain you…
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Regional CJK disambiguationCJK entity disambiguation
CJK entity disambiguation is the practice of resolving brand and product entities across Chinese, Japanese, and Korean…
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ConceptE-E-A-T
E-E-A-T — Experience, Expertise, Authoritativeness, and Trustworthiness — is Google's framework for assessing content…
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TechnicalEntity disambiguation
Entity disambiguation is the process of distinguishing one named entity — a company, product, or person — from others…
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Strategy GEOGenerative Engine Optimization (GEO)
Generative Engine Optimization (GEO) is the practice of structuring content, entities, and off-site signals so…
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ConceptGenerative search
Generative search is search where the interface produces a synthesized natural-language answer — not only ranked links…
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ConceptGoogle AI Mode
Google AI Mode is Google Search's conversational, fully generative interface where users interact with an AI assistant…
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TechnicalKnowledge graph
A knowledge graph is a structured network of entities (people, companies, products, places) and the relationships…
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ConceptLLM citation
An LLM citation is when a large language model names a source — usually as an inline link, footnote, or reference card…
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Formatllms.txt
llms.txt is a plain-text file, conventionally served at /llms.txt, that summarizes a site for LLM crawlers and agents —…
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RegionalLocal answer engines
Local answer engines are search or AI-assisted products dominant in a specific country or language — Naver in Korea,…
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TechnicalModel grounding
Model grounding is the process of anchoring an LLM's generated answer to retrieved, verifiable sources — URLs,…
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RegionalModel market share
Model market share is the relative usage of AI answer engines — ChatGPT, Perplexity, Google AI Mode, Gemini, Copilot,…
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RegionalMultilingual GEO
Multilingual GEO is the practice of optimizing for AI-generated answers in more than one language, recognizing that a…
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ConceptPrompt surfacing
Prompt surfacing is the set of techniques for discovering which natural-language questions buyers actually ask AI…
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TechnicalQuery fan-out
Query fan-out is when a search or AI system decomposes one user prompt into multiple sub-queries, retrieves results for…
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Technical RAGRetrieval-augmented generation (RAG)
Retrieval-augmented generation (RAG) is an architecture where an LLM fetches relevant documents or URLs before…
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StrategySemantic SEO
Semantic SEO is the practice of optimizing content for meaning, entities, and topical relationships — not keyword…
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Concept SGESGE and AI Overviews (AIO)
SGE (Search Generative Experience) was Google's experimental label for AI-generated summaries in Search; the shipped…
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Metric Share of voiceShare of voice (AI)
Share of voice in AI search is the proportion of brand mentions a company captures within AI-generated answers for a…
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Technical Structured dataStructured data (schema.org)
Structured data is machine-readable markup — typically JSON-LD using schema.org vocabulary — embedded in HTML so search…
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ConceptZero-click search
Zero-click search is when a user's query is satisfied on the results page or inside a generated answer without clicking…
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