Microcomputers :- A microcomputer is a small computer that is used by one person at a time. The desktop computers that you you see in most offices, schools, colleges, and homes are microcomputers. They are also called personal computers or PCs.
Mainframe computers :- Mainframe computers are big, powerful, and expensive multiuser computers. They are mainly used for bulk data processing in large organizations like governments, airlines, and banks. The IBM zEnterprise and Unisys ClearPath are examples of mainframes.