Johannes Gutenberg introduced the concept of movable type and the printing press to Europe. While this may not sound like a big deal at first, the printing press is often considered as the most important invention in modern times. Think about how important information is today.
Without books and computers you wouldn't be able to learn, to pass on information, or to share scientific discoveries. Before Gutenberg invented the printing press, making a book was a long and difficult process in Europe. It wasn't that hard to write a letter to one person by hand, but to create thousands of books for many people to read was nearly impossible. Johannes Gutenberg changed the way books were printed and made it much easier for people to get books