React is a modern framework that uses components to create web applications. React’s component architecture allows you to reuse components across different areas of your app. Moreover, each component has its own rendering principle and internal logic. This virtualization approach grants React outstanding scaling opportunities. In addition, React components can be rendered quickly with minimum number of updates, resulting in a big performance boost.

The React community is still growing. However, you can already find some libraries for the framework on the Internet. The Facebook Ads Manager, for example, uses React. This framework is also compatible with iOS and Android. You can even use React Native to convert an outdated web application to a native app.

The components in React are composed of classes and functions. Each component can have its own set of properties and functions. Data flows from a parent component to child components. In React, the top-level component is called an “App”. State is a key concept. A state is an object that stores data and can change as the user interacts with the interface.

ReactJS was created by Facebook developers, who realized that the DOM was slow. So they implemented a virtual DOM, which is a JavaScript representation of a DOM tree. In this way, React can read from the DOM and write to it in the most efficient way possible.