What is React.js
Official documentation for react describes it as
Why use react?
React is currently one of the most learnt and sought after technology in terms of usage and job market. Having it in your skill set will definitely increase your demand as a web developer.
React lets you break the user interface into small pieces called components. These components can be re-used across the application which makes application development and maintenance very easier.
This course will teach you how to use react for building interactive web applications.