The 4th Generation of computers (~1970/1975 to ~1990) almost exclusively use Integrated Circuits throughout their design. This allows the computers to be very small, some being built on a single circuit board. This gives them the name of Microcomputer.
You still get Mainframes, Supercomputers and Minicomputers, but it was the Microcomputer with its cheap price which really brought the computer to the home market.
Game Orientated Machines