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Box2D is a free, open-source C++ physics engine that simulates realistic 2D dynamics—gravity, friction, collisions, joints, and constraints. Game engines like Cocos2d-x and Defold ship with Box2D built-in, and it can be integrated into any rendering pipeline via C++ or language bindings. Indie game developers and physics simulation specialists need Box2D to ship polished games. Understanding physics engines teaches core game programming concepts (collision, constraints, continuous simulation). Box2D expertise opens doors to game studios, physics research, and robotics teams.