computers are made up of many components. Most of these are internal. However, some are connected externally, using ports. A port is a kind of plug, usually located at the back of the computer.Components located outside the computer's case are reffered to as peripheral devices.
Because they use components, PC's are customisable. You can add components for specific task, such as playing sound, and choose more powerful and expensive part to make a high-end pc.Conversely, you can specify less powerful, cheaper components for a basic offer computer.
This means that pc's veryquite widely in terms of performance, cost and the sort of applications that they can run.
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