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There are 3 different types of computers in common use; 1  PC(Personal Computer) - These are the standard desktop or tower computers. 2  Laptop - Also known as Notebooks. 3  Servers - Physically these may resemble PCs, or may come on a rack-mountable form.
A computer is a machine that is able to take information (input), do some work on or make changes to the information, to make new information (output). Computers have existed for much of human history. computer is only useful if it has both hardware and software. Hardware is the physical parts the computer is made of-for example keyboard, mouse, screen, tower, and the circuits inside it.