What's inside of a CPU?

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A CPU is an integrated circuit, sometimes known as a chip, at the hardware level. Millions or billions of microscopic electrical bits are 'integrated' into integrated circuits, which are then organised into circuits and packed into a small box.
Some layers are real things, like as the chip and transistors, while others are abstractions, such as logic circuits and gates.
It's amazing that we can combine relatively simple components like logic gates to produce CPUs that power complicated devices like phones, computers, and even self-driving cars.