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React is an open-source JavaScript library for building user interfaces and UI components. Developed and maintained by Facebook, it's commonly used in web development to create single-page applications with dynamic content that can change without needing a full page reload. React operates on a virtual DOM (Document Object Model), which allows it to efficiently re-render individual components instead of the entire page whenever data changes, resulting in faster updates and improved performance. The component-based architecture encourages code reusability and maintainability while providing developers with a declarative syntax that makes their code more predictable and easier to debug. React works well with other libraries or frameworks such as Redux or Next.js, enabling the creation of more complex applications when combined effectively.

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