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1. Personal Computer: A Personal Computer can be defined as a small, relatively inexpensive computer designed for an individual user.
Personal Computers are based on the microprocessor technology that enables manufacturers to put an entire CPU on one chip. Businesses use personal computers for word processing, accounting, desktop publishing, and for running spreadsheet and database management applications. At home, the most popular use for personal computers is playing games and surfing the Internet.
2. Mini Computer: Mini Computer is a midsize multi-processing system capable of supporting up to 250 users simultaneously.
These were designed for specific tasks but have now lost popularity due to the advent of PCs.
3. Mainframes Computer : Mainframe is very large in size and is an expensive computer capable of supporting hundreds or even thousands of users simultaneously. Mainframe executes many programs concurrently and supports many simultaneous executions of programs.