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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.
There are three types of computer displays: The CRT monitor. These are big and heavy and use a lot of desk space and electricity. It is the oldest technology used by monitors and is based on the cathode ray tube technology that was developed for television.