- React. js is an open-source JavaScript library that is used for building user interfaces specifically for single-page applications. It's used for handling the view layer for web and mobile apps. React also allows us to create reusable UI components.
- React is a frontend library, which runs in the browser. Like any other frontend library (jQuery, etc), it is happy to be served by any old webserver – Apache, NGINX – or any kind of backend – PHP, Rails, and so on
