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A processor is an integrated electronic circuit that performs the calculations that run a computer. A processor performs arithmetical, logical, input/output (I/O) and other basic instructions that are passed from an operating system (OS). Most other processes are dependent on the operations of a processor.
The terms processor, CPU and microprocessor are commonly linked.
A processor includes an arithmetical logic and control unit (CU), which measures capability in terms of the following:
Most people just say processor instead of "CPU" nowadays.