Next.js is a React framework that enables you to build web applications with server-side rendering, static site generation, and client-side rendering in a single project. Developers use it to streamline full-stack development by automatically optimizing pages for performance, handling routing, and providing built-in compilation and bundling. It's particularly useful when you need flexibility in how pages are rendered, want to reduce client-side JavaScript, or need a structured approach to building React applications at scale.

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