Giant robots

The term mecha (メカ, meka^?) may refer to both scientific ideas and science fiction genres that centers on robots or machines controlled by people. Mechas are typically depicted as "walker" types of Mobile robots.

These machines vary greatly in size and shape, but are distinguished from vehicles by their humanoid or biomorphic appearance. Different subgenres exist, with varying connotations of realism. The concept of Super Robot and Real Robot are two such examples found in Japanese anime. The term may also refer to real world piloted humanoid robots / non-humanoid robotic platforms, either currently in existence or still on the drawing board (i.e. at the planning or design stage). Alternatively, in the original Japanese context of the word (see Characteristics), 'mecha' may refer to mobile machinery/vehicles (including aircraft) in general, manned or otherwise.

The word "mecha" (メカ, meka^?) is an abbreviation first used in Japanese of the word "". In Japanese, mecha encompasses all mechanical objects, including cars, guns, computers, and other devices, and the term "robot" (ロボット, robotto^?) or "giant robot" to distinguish limbed vehicles from other mechanical devices. Outside of this usage, it has become associated with large robots with limbs or other biological characteristics.

...
Wikipedia