> ## Documentation Index
> Fetch the complete documentation index at: https://wiki.platelunchcollective.com/llms.txt
> Use this file to discover all available pages before exploring further.

# AI Hallucination

> AI hallucination is the phenomenon where a large language model generates plausible-sounding but factually incorrect or fabricated information.

*Core concept* · *AI Search Infrastructure*

## Definition

AI hallucination is the phenomenon where a large language model generates plausible-sounding but factually incorrect or fabricated information. Hallucinations occur when the model fills gaps in its knowledge with confident-sounding inference rather than verified facts.

## Why It Matters for AI Search

Hallucination is the primary accuracy risk in AI search for brands. An AI system that hallucinates about a brand — inventing founding dates, misattributing services, fabricating locations — damages brand representation in ways that are invisible to the brand unless actively monitored. Hallucination mitigation strategies — structured data, Wikidata entries, authoritative third-party coverage — reduce the gaps in AI knowledge that hallucinations fill. Regular LLM probing to detect hallucinations is part of a complete AI search management program.

## Related Terms

<CardGroup cols={2}>
  <Card title="Hallucination mitigation" href="/ai-search-glossary/hallucination-mitigation" />

  <Card title="Brand grounding" href="/ai-search-glossary/brand-grounding" />

  <Card title="LLM brand recall" href="/ai-search-glossary/llm-brand-recall" />

  <Card title="Data sanitation" href="/ai-search-glossary/data-sanitation" />

  <Card title="Entity verification" href="/ai-search-glossary/entity-verification" />
</CardGroup>

## Relevant Plate Lunch Collective Services

[Context Map](https://www.platelunchcollective.com/services/context-map)  [AI Search Visibility Assessment](https://www.platelunchcollective.com/services/context-map)  [Entity SEO](https://www.platelunchcollective.com/services/entity-seo)