But you've probably never even heard of the second-most printed book. It's known as the "Little Red Book."
It's a collection of statements from the speeches and writings of Mao Zedong, the founder of the People's Republic of China.
Mao, who once said that "to read too many books is harmful," had more than one billion copies of this single book printed and distributed.
Its purpose was to force people to internalize Mao's ideals. This elevated him to the status of deity within China.
The book remained an icon of Mao Zedong's cult of personality and a mainstay in Chinese culture through the '70s.
As a result, an entire generation of Chinese have grown up not knowing anything better than what the Party has to offer them.