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All general-purpose computers require the following hardware components:
memory : Enables a computer to store, at least temporarily, data and programs.
mass storage device : Allows a computer to permanently retain large amounts of data. Common mass storage devices include disk drives and tape drives.
input device : Usually a keyboard and mouse, the input device is the conduit through which data and instructions enter a computer.
output device : A display screen, printer, or other device that lets you see what the computer has accomplished.
central processing unit (CPU): The heart of the computer, this is the component that actually executes instructions.
Computers can be generally classified by size and power as follows, though there is considerable overlap: personal computer : A small, single-user computer based on a microprocessor
workstation : A powerful, single-user computer. A workstation is like a personal computer, but it has a more powerful microprocessor and a higher-quality monitor.

minicomputer : A multi-user computer capable of supporting from 10 to hundreds of users simultaneously. mainframe: A powerful multi-user computer capable of supporting many hundreds or thousands of users simultaneously. supercomputer : An extremely fast computer that can perform hundreds of millions of instructions per second.

minicomputer : A multi-user computer capable of supporting from 10 to hundreds of users simultaneously. mainframe: A powerful multi-user computer capable of supporting many hundreds or thousands of users simultaneously. supercomputer : An extremely fast computer that can perform hundreds of millions of instructions per second.