The document discusses different modes of documentaries including participatory, expository, and observational. Participatory documentaries feature the filmmaker asking questions and sharing their views. Expository documentaries aim to advance an argument through narration and archival footage. Observational documentaries objectively observe and record events without narration to allow the audience to draw their own conclusions. Examples provided include Morgan Spurlock's "Super Size Me" for participatory and the 1970's film "Gimme Shelter" for observational.