React.js is an open-source JavaScript-based user interface library. It is hugely popular for web and mobile app development.

React follows the principle of component-based architecture. A component in React is an isolated and reusable piece of code. The components can be of two types – class components and functional components.

Before React version 16.8, developers could handle state and other React features only using class components. But with version 16.8, React introduced a new pattern called Hooks.

With React Hooks, we can use state, and other React features, in a functional component. It empowers devs to do functional programming in React.
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