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A mecha, or mech, is a term for a large crewed-robotic/human-piloted humanoid construct or vehicle. Originally coming from science fiction, the term is increasingly seeing mainstream non-fictional usage.

This definition is not perfect: variants do exist, as these machines vary greatly in size, shape, appearance, performance and capabilities; from ones on wheels or treads, to submersible or VTOL-flight, to animal or insect-like shapes. The key difference between manned-"mecha" and an unmanned-"robot" is that a mecha has a pilot.