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Types of computers are based upon the purpose, functioning and size of the computer. Accordingly they are classified into four types:

• Super computers
• Mainframe computers
• Mini computers
• Micro computers

Super computers

• Most powerful computers characterized as fastest, very high processing speed and of large data storage.
• Specifically used for complex applications by big organization.
• Good example is NASA and ISRO uses supercomputers to track and control space discovery.

Mainframe computers

• Capable of performing high processing speed and data storage but not powerful as super computers.
• Wired in air-conditioned rooms.
• Example: ISP providers use mainframe computers to process information about millions of internet users.

Mini computers

• Less processing speed than mainframe computers.
• Departments of large company's uses this type of computers.
• They can handle large database and accounting efficiently.
• Example: Department of computer monitoring the network traffic of whole company.

Micro computers

• Least powerful type of computers but are the most widely used and growing in the fastest rate.
• Hardware peripherals can be attached easily.
• Includes Desktop computers, Laptops, tablet pc's, Personal Digital Assistants(PDA) etc.