langchain/docs/modules/document_loaders/key_concepts.md

Key Concepts

Document

This class is a container for document information. This contains two parts:

• page_content: The content of the actual page itself.
• metadata: The metadata associated with the document. This can be things like the file path, the url, etc.

Loader

This base class is a way to load documents. It exposes a load method that returns Document objects.

Unstructured

Unstructured is a python package specifically focused on transformations from raw documents to text.