React JS is a popular JavaScript library used for building user interfaces for web applications. It was developed by Facebook and is now maintained by both Facebook and a community of developers.

React allows developers to create reusable UI components that can be used to build complex user interfaces. These components are self-contained and can manage their own state, making it easier to develop and maintain large-scale applications. React follows a component-based architecture, where the user interface is broken down into smaller, reusable pieces called components. These components can be combined to create the overall user interface.

One of the key features of React is its use of a virtual DOM (Document Object Model). The virtual DOM is a lightweight representation of the actual DOM, and React uses it to efficiently update only the necessary parts of the user interface when there are changes. This approach minimizes the number of direct manipulations to the DOM, resulting in improved performance and a smoother user experience.

React also supports a declarative programming style, where developers describe how the UI should look based on its state, and React takes care of updating the UI automatically when the state changes. This makes it easier to reason about the application's behavior and helps in writing clean and maintainable code.

React can be used in combination with other libraries or frameworks to build complete web applications. It is often used alongside other tools such as Redux for state management or React Router for routing within an application.

Overall, React JS provides a powerful and efficient way to build user interfaces for web applications, making it a popular choice among developers.

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