Microprocessors are the main functioning units of the computer. It controls all the internal activities of the computer. It performs logical and arithmetical operations internally and helps in reading and writing externally. The microprocessor can perform functions like addition, subtraction, comparison of two numbers and fetches numbers from one area to the other. When you turn on your computer the microprocessor gets the first set of instructions from the central input/output system or BIOS. Thereafter the BIOS or the operating system that is loaded by BIOS into the computer memory drives the microprocessor to perform as per the instructions given.

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