1: Documentary is a genre that aims to convey or interpret reality, but it does so through constructed versions of reality that reflect the filmmakers' points of view.
2: There are various styles of documentary, from expository documentaries that aim to directly inform audiences, to more observational styles like cinéma vérité that seek to minimize interference. More recent hybrid styles also exist.
3: The conventions documentaries use to convey information, like voiceovers, interviews, camerawork and editing, are part of how they creatively transform reality rather than simply record it. How these conventions are employed shapes the audiences' perspectives.