They are four classifications of a computer by size name:

(i) Microcomputer      

 (ii) Minicomputer

(iii) Mainframe computer

(iv) Supercomputer

Micro Computer: A microcomputer is the smallest computer that has a processor on a single silicon chip. Its CPU is a microprocessor chip. Examples of microcomputers are personal computers (PC), laptop computers, desktop computers, palmtop computers, etc.