> ## 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.

# Knowledge Base

> A knowledge base is a structured repository of information about entities and their relationships — used by AI systems as a reference for fact-checking, enti...

*Technical implementation* · *Entity & Knowledge Graph*

## Definition

A knowledge base is a structured repository of information about entities and their relationships — used by AI systems as a reference for fact-checking, entity disambiguation, and grounded response generation. Wikipedia, Wikidata, and proprietary enterprise knowledge bases are all examples.

## Why It Matters for AI Search

Knowledge bases are the external reference layer that grounded AI responses draw from. A brand that is accurately represented in major public knowledge bases — Wikipedia and Wikidata — has a reliable anchor for AI responses that query those sources. Brands building internal AI applications can also maintain proprietary knowledge bases that ensure their AI systems have accurate, current information about the brand's products, services, and positioning.

## Related Terms

<CardGroup cols={2}>
  <Card title="Knowledge graph" href="/ai-search-glossary/knowledge-graph" />

  <Card title="Wikidata" href="/ai-search-glossary/wikidata" />

  <Card title="Wikipedia" href="/ai-search-glossary/wikipedia" />

  <Card title="RAG" href="/ai-search-glossary/rag" />

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

## Relevant Plate Lunch Collective Services

[Entity SEO](https://www.platelunchcollective.com/services/entity-seo)  [AI SEO](https://www.platelunchcollective.com/services/ai-seo)