The inventor of the printing press was Johannes Gutenberg who was born in 1398 in present-day Germany.
Before his time, books had to be made pretty much by hand. Making them extremely expensive, and probably error ridden with typos too.
The printing press made books boom, and let a larger amount of people read and with that intelligence boomed with the new access to education.
Gutenberg's most famous printing was his famous bibles. Which are worth quite a fortune now.