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The main job of the CPU is to execute programs using the fetch-decode-execute cycle (also known as the instruction cycle). This cycle begins as soon as you turn on a computer. To execute a program, the program code is copied from secondary storage into the main memory.
The fetch-execute cycle (also known as fetch-decode-execute cycle) is followed by a processor to process an instruction. The cycle consists of several stages.
https://www.bbc.co.uk/bitesize/guides/z2342hv/revision/5
https://en.wikipedia.org/wiki/Instruction_cycle
https://www.desktopclass.com/computer-it/explain-the-fetch-decode-execute-cycle-of-cpu.html
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