React js is a component-based library which helps to develop the interactive user interface. It is the most popular front-end JavaScript framework, it deals with MVC controller. It is maintained by Facebook and Instagram. If you are interested to work with React js, you need to have a solid knowledge of HTML, CSS and JavaScript. React js uses virtual DOM, this helps to improve your performance. A programmer can build amazing single page applications with Redux and ReactJS. Every day you need to update yourself with current innovations, without learning it is difficult to survive in this world.