The printing press was a useful invention, because everybody could have a lot of copies without having to write them all out by hand. The invention specifically helped spread religion, which I am going to talk about later on.
The earliest printing press, in Tang China during the 600s, looked like a woodblock with raised reversed letters on the bottom. It would be stamped in ink and used for making a lot of copies of writing. It was also used for printing out pictures of the emperor.
One of the earliest ways in which it helped the Chinese was through the mass production of Buddhist scriptures, because the Chinese were skilled at making them. It helped them with the Diamond Sutra and other scriptures that were very important to Buddhism. It was useful in helping Buddhism to travel around China because people would be reading the many printed scriptures.
In the 11th Century, the Song Chinese developed the movable type printing press.