What are three parts of CPU and what does each do?

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The central processing unit is responsible for handling

instructions passed to it by programs and input devices. The

arithmetic logic unit handles the arithmetic and logic functions.

The control unit is responsible for processing instructions that

come from the computer's memory and activating the other components

of the computer. The cache is the memory in which instructions are

temporarily stored.

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Though CPUs are still commonly used, computers no longer require

them to function as they are able to use multiple processors in

tandem.