Types of Computer:-

Computers can be generally classified by size and power as follows:

Personal computer: A small, single-user computer based on a microprocessor.
Personal computers are designed as single-user systems, these systems are normally linked together to form a network

Workstation: A powerful, single-user computer. A workstation is like a personal computer, but it has a more powerful microprocessor and, in general, a higher-quality monitor.
Common operating systems for workstations are UNIX and Windows NT. Like PC, workstations are also single-user computers like PC but are typically linked together to form a local-area network, although they can also be used as stand-alone systems.


Minicomputer: A multi-user computer capable of supporting up to hundreds of users simultaneously.

It is a midsize multi-processing system capable of supporting up to 250 users simultaneously.

Mainframe: A powerful multi-user computer capable of supporting many hundreds or thousands of users simultaneously.
It executes many programs concurrently and supports many simultaneous execution of programs.

Supercomputer: An extremely fast computer that can perform hundreds of millions of instructions per second.

Supercomputers are very expensive and are employed for specialized applications that require immense amount of mathematical calculations.

Examples: Weather forecasting, scientific simulations, (animated) graphics, fluid dynamic calculations, nuclear energy research, electronic design, and analysis of geological data