• A CPUis 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.

Read More: In a CPU, what is a control unit?