PSA

A PSA is a Public Service Announcement that is a 30-second ad about an important social issue run for free on television networks.  The purpose of a PSA is to either bring attention to or teach the public about a particular social topic.  The NBC series, The More You Know, and the Character Counts series are good examples.  The Islamic Media Foundation (IMF) has a series of PSAs ranging in topics from immigration to countering Islamophobia.