A diary film is a type of documentary that is often told by the filmmaker themself in the first person. The subject of a diary film is almost always a personal interest of the filmmaker. It might be a story from their past, or a recent personal experience, or just their thoughts and opinions about an event, past or present. It might be about art, or politics, or religion or history. It might be about a memory, or a dream. It can really be about anything that is of current interest to the filmmaker.