Documentaries aim to inform audiences about factual subjects using real footage and interviews. Documentary film began in 1895 with the Lumiere brothers and evolved with Nanook of the North in 1922, which was the first feature-length factual film. There are five key elements to documentaries: observation, interviews, dramatization, mise en scene, and exposition. These elements such as observation use unseen cameras to make audiences feel like eyewitnesses, while interviews provide different opinions to support or contrast observations.