The most important invention in the history of computers is (arguably) the transistor. A transistor can serve two purposes:
It can amplify a signal (transistor radio).
It can switch on and off ridiculously fast. This fast switching is what allows a computer to make decisions very fast.
Think of a transistor like a
gate which either allows electricity through (1) or blocks it (0). If a small amount of electricity is applied to the
base pin, whatever is on the
collector pin is permitted through the
Controlling electricity like this gives us the ability to create
boolean logic or