The world knows of China's censorship of media. They censor all types of mediums including television, print media, radio, film, theater, text messaging, instant messaging, video games, literature and the Internet. A wide variety of subject matter is censored by the government: politics, cultural, moral, religious, & economic.
Anything that can essentially tarnish the government's reputation with topics ranging from independence of the people to corruption and anarchism is censored. Pornography and some religious texts, publications, and materials are also banned.