What is a Node in llamaindex?

Beginner here.
I dont know whats a node. Then, why does the splitter use nodes?

Hi Veeru1 welcome to the community : acording to llamaIndex docs

A Node represents a “chunk” of a source Document, whether that is a text chunk, an image, or other. Similar to Documents, they contain metadata and relationship information with other nodes.
In others words pieces of data with metadata related

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