What does censorship mean?

Censorship means when something is banned or not allowed to do or to use.

the suppression or prohibition of any parts of books, films, news, etc. that are considered obscene, politically unacceptable, or a threat to security

the suppression of speech, public communication, or other information, on the basis that such material is considered objectionable, harmful, sensitive, or "inconvenient"

can be conducted by a government, private institutions, and corporations