This document discusses how to use React with SharePoint Framework (SPFx) web parts. It begins with an overview of React, explaining that it is a JavaScript library for building user interfaces. It then covers how React can be combined with SPFx by importing React and ReactDOM in the web part code. The document demonstrates creating a basic React component in an SPFx web part, and also shows more advanced examples like multi-page React web parts and extending the property pane with React. Resources for learning more about React and React with SPFx are provided.