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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.
Computers come in different forms, but most of them have a common design. 1  All computers have a CPU. 2  All computers have some kind of data bus which lets them get inputs or output things to the environment. 3  All computers have some form of memory. These are usually chips (integrated circuits) which can hold information.