React is an open-source JavaScript library for building user interfaces or UI components. It is maintained by Facebook and a community of individual developers and companies. React can be used as a base in the development of single-page or mobile applications.
React.js is the most popular front-end library for building Web applicatons
💡 TLDR:
* React is a JavaScript library created by Facebook.
* React is a User Interface (UI) library
* React is a tool for building UI components