ReactJS

React is a js library based on UI development. Although React is a library rather than a language, it is widely used in web development. The library first appeared in May 2013 and is now one of the most commonly used frontend libraries for web development.

React is a JavaScript library used for building fast and scalable user interfaces for websites and applications. It allows developers to create large web applications that can change data without reloading a page.

One of the major reasons for the popularity of React JS is its ability to create rich user interfaces. 

Which is better, React or Angular?

React is better than Angular due to it's virtual DOM implementation and rendering optimizations. Migrating between React's versions is quite easy, too; you don't need to install updates one by one, as in the case of Angular. Finally, with React, developers have myriads of existing solutions they can use.