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A Central Processing Unit (CPU) (also called microprocessor, or simply just processor) is the part of a computer that executes instructions from software. At its most basic level, a CPU fetches an instruction, decodes what it’s supposed to do, executes the operation (such as an arithmetic calculation or a memory access), and then writes the result back. This is commonly known as the fetch-decode-execute cycle. Related Story Arm Doubles AGI CPU Revenue Forecast to $2 Billion by 2028 as OpenAI, Cerebras, and Hyperscalers Pile Into Agentic AI Orders At the physical level, a CPU isn’t magic. It’s