What is ... censorship?  

Overview

If you have censorship enabled on some of your messageboards or guestbooks, then any new entries will not be published without first being screened by the admin user. The message/entry is in this in-between state, it is called a suppressed message and must be progressed from the censorship centre.

You can look on censorship as a safety net for messages before they appear on the public section of the site.