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React Three Fiber is a React renderer for Three.js that enables declarative 3D scene creation using React components, hooks, and state. While Three.js offers full control with an imperative programming model, React Three Fiber provides better React integration, automatic lifecycle management, built-in render loops, and a rich ecosystem. For React developers building applications that mix UI and 3D interactions, React Three Fiber typically offers better scalability and maintainability, though Three.js remains ideal for non-React projects or when low-level WebGL control is needed.