What is frame construction?

there are three types of car construction: 1)body over frame 2)monocoque 3)spaceframe in body over frame there is a separate body and a chassy..all the powertrain components including the engine are found in the chassy and the body is fastened over it...in monocoque there is a single body unit no separate body and chassy eg.small cars...spaceframe structure is used in race cars..