React is a popular JavaScript library developed by Facebook. It’s used for building user interfaces (UIs) for web applications, focusing on creating interactive, responsive, and efficient UI components. React allows developers to create reusable UI components that manage their own state and can be composed to build complex user interfaces.

One of the core concepts of React is its use of a virtual DOM (Document Object Model). Instead of directly manipulating the browser’s DOM, React creates a virtual representation of the DOM in memory, allowing it to efficiently update and render only the necessary components when the data changes. This approach leads to better performance and a smoother user experience.

React also promotes a component-based architecture, where the UI is divided into independent and reusable components, each responsible for its own logic and rendering. This modular approach simplifies development, maintenance, and testing of large-scale applications.

It’s important to note that React is just a UI library and focuses solely on the view layer of the application. To create a complete application, developers often combine React with other libraries, tools, and frameworks for state management (like Redux or React Context), routing, and backend interactions.

Overall, React has gained widespread adoption in the web development community due to its simplicity, performance optimizations, and component-based architecture, making it a go-to choice for building modern web applications.

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