It's a JavaScript library for building user interfaces. It allows developers to create reusable UI components that update efficiently and automatically when data changes. React follows a declarative approach, making it easier to manage the state of an application and render dynamic content.
The major features of ReactJS are as follows:
- It uses VirtualDOM.
- Follows Unidirectional data flow or data binding
- Uses reusable/composable UI components to develop the view
- Increases the application’s performance with Virtual DOM
- JSX makes code easy to read and write
- It renders both on client and server side
- Easy to integrate with other frameworks (Angular, BackboneJS) since it is only a view library
- Easy to write UI Test cases and integration with tools such as JEST.