A chunk is a unit of information or a portion of data that is grouped together as a single entity. It is often used in the context of organizing and processing large amounts of data or to represent a specific section of content within a document or file.

Chunks can be of variable lengths and can hold various types of data, such as text, images, audio, or video. They are typically used to simplify the handling and manipulation of data by breaking it down into manageable pieces.

In programming and computer science, chunks are commonly used in techniques like chunking algorithms, where data is divided into smaller parts for more efficient processing. Chunks can also refer to the notation used in languages like HTML or Markdown to indicate specific sections or elements within a document.