A documentary is a film that documents or captures reality using real footage and evidence to reveal an unknown angle or perspective. Documentaries allow the public to share their views on important issues and events through interviews and footage of real people and places. They present an argument or case to help audiences learn something new, often about the past or unfamiliar present-day topics, using conventions like authoritative voiceovers, authenticated expert interviews, and on-screen text to provide context. Documentaries come in different styles like expository with narration, observational allowing footage to speak for itself, and reflexive acknowledging the filmmaking process.