Here is an interesting video of how a microprocessor is made.

“Microprocessors normally serve as the CPU in a computer system and are basically “digital electronic component[s] with miniaturized transistors on a single semiconductor integrated circuit. Microprocessors made possible the advent of the microcomputer. Before this, electronic CPUs were typically made from bulky discrete switching devices (and later small-scale integrated circuits) containing the equivalent of only a few transistors”