The document discusses the history and purposes of documentaries. It notes that documentaries began in 1895 with short, unedited films by the Lumiere Brothers to document aspects of reality. The first feature-length documentary was 1922's Nanook of the North, which staged scenes for dramatic effect. Modern documentaries strive for direct, unmediated presentations of events and use techniques like observation footage, interviews, dramatization, mise-en-scene, and exposition to both inform and entertain audiences. Common documentary types include fully narrated, "fly on the wall", mixed, self-reflective, docusoaps, and docudramas.