React or React.js code example

Example 1: difference between React Native and React

ReactJS is a JavaScript library, supporting both front-end web and being run on a server, for building user interfaces and web applications.

React Native is a mobile framework that compiles to native app components, allowing you to build native mobile applications for different platforms (iOS, Android, and Windows Mobile) in JavaScript that allows you to use ReactJS to build your components, and implements ReactJS under the hood.

Both are open sourced by Facebook.

Example 2: what is react

This is a formatted version of Komadori's answer 
(https://tinyurl.com/Komadori)
React is a JavaScript library for building user interfaces. 
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.