A documentary focuses on real people and events to allow audiences to form opinions. It documents something that has occurred through actual footage or reconstruction, sometimes using narration or interviews. There are five key elements - observation, interviews, dramatization, mise-en-scene, and exposition. There are also different types of documentaries, including fully narrated, fly on the wall, mixed, self-reflexive, and docudrama styles that utilize varying combinations of narration, interviews, and reconstructed scenes.