A documentary uses a voice over narration to provide context and commentary on current events being filmed without revealing the identity of the narrator. There are different styles of documentary filming including direct cinema which uses no narration and just observes subjects, and cinema verité which is a French style that is the truest form of observation without commentary. Mixed documentaries incorporate a variety of elements like interviews, observations, archival footage, and narration to tell a story based on real events and people in a particular location over a period of time.