Mecha is the genre of giant robots and mechanical vehicles, named for the machinery itself. It spans two great traditions: super robot stories, where the machine is a near-magical hero, and real robot stories, where it is mass-produced military hardware.
The genre's founding split came early. Mazinger Z in 1972 established the super robot: a unique, powerful machine piloted by a hero, fought like a duelist. Mobile Suit Gundam in 1979 answered with the real robot: machines built by corporations, maintained by crews, and used up like tanks in a war neither side fully controls. Most mecha since lives somewhere on the line between those poles.
Mecha design is a discipline of its own. Fans read silhouettes, model numbers, and equipment variants the way other fandoms read character rosters, and a series' mechanical designer is a headline credit. The genre also overlaps freely: mecha appears inside space opera, military drama, school stories, and horror.
Because the machines are products as much as characters, mecha is where anime's media mix is most visible. A new design exists to be watched, discussed, and built as a plastic model kit, and the fandom's vocabulary of grades, scales, and variants grew up around exactly that loop. Pilots are usually young for story reasons the genre settled early: the machine must be powerful, and the person trusted with it must still be learning what power costs.
In use"A one-of-a-kind robot that answers a hero's call is super robot; a scratched unit off an assembly line is real robot."