
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 (IC)”. Video clip after the jump.
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
[via Wikipedia]