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

> A Chunk is a piece of content and [Annotations](/core-resources/annotation) that are relevant to that Chunk.

# Chunk

A Chunk is a subset of a [Message](https://docs.genai.scale.com/core-resources/message.md). [Annotations](https://docs.genai.scale.com/core-resources/annotation.md) at the Chunk level directly apply to that part of the [Message](https://docs.genai.scale.com/core-resources/message.md). For example, a single sentence in a paragraph could be a Chunk with its own Annotations.