Supercomputer: are the most powerful computer.These machines are special high-capacity computers used very large organizations.

Mainframe computers occupy special wired,air-conditioned rooms.Although not nearly as powerful as supercomputers,mainframe computers are capable of great processing speeds and data storage.

Minicomputers,also known as midrange computers,are refrigerator-sized machines.Medium-sized companies or departments of large companies typically use them for special purpose.

Microcomputers are the least powerful.

Microcomputers are the most common type.

There are six types of microcomputers: desktop,media center,notebook,tablet PC,netbook and handheld computers.