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React is a very flexible and efficient JavaScript library for building interactive user interfaces. It makes it easier to make web applications with essential features such as reusable components, state management, DOM rendering and many more which are explained later. In this article we’ll see the fundamentals of react library and why is it so popular. React forms the view layer of the web application which is technically the frontend. It is a mixture of both JavaScript and XML as well HTML/XML to render onto the screen.