Documentaries aim to document real events or topics through actual footage or reconstructions. They can use narration to provide context or rely on interviews with subjects. Documentaries are not purely factual but use facts to make socially critical arguments. There are different styles including fully narrated, observational, mixed formats using interviews and narration, self-reflective acknowledging the filmmaker's role, and docudramas which recreate events. Producers act as gatekeepers in selecting what information and perspectives to include or exclude in a documentary.