A documentary aims to document and inform viewers about some aspect of reality for purposes of instruction or maintaining a historical record. Early documentary films from the 1890s consisted of single shot moments captured on film to demonstrate novelty, while modern documentaries use various techniques like interviews, narration, observation, and reenactment to engage and educate audiences on their topics. Key documentary styles discussed are direct cinema, cinema verite, fully narrated, fly on the wall, mixed, self-reflective, reenactment of events, and docusoaps.