Generally the computer system are classified as MICRO ,MINI and MAINFRAME Computers.

MICRO Computer

Micro Computer are small ,single user that provides a simple processor and a few input/output devices.The micro computer is also known as Personal Computer(PC).

MINI Computer

Mini Computer were first developed as special purpose mainframe computers .They were widely used for instance , to control machine manufacturing unit.

MAINFRAME Computer

Mainframe computer can process several million program instruction per second. They were mainly used in insurance companies,banks,airlines,railway reservation system,etc.Mainframe have more access to storage space and to i/p device. To work with these extra device mainframe also have more powerful "PROCESSOR".