The document describes four main types of documentaries:
Fully narrated documentaries use voiceover and narration to provide context to the visuals. The narrator is like the "voice of God" explaining what is happening. Planet Earth is an example.
Fly on the wall or cinema verite documentaries have little narration and are filmed observationally as events unfold. Examples include Police, Camera, Action.
Mixed documentaries combine interviews, observations, and narration to represent an objective reality rather than just a selective perspective. The Jinx is used as an example.
Self-reflexive documentaries examine the filmmaking process itself or bring attention to their constructed nature.