This document provides an overview of documentaries and expository documentaries. It defines a documentary as a film that attempts to document or record aspects of the real world. Expository documentaries specifically use facts and recorded images/sounds to create a socially critical argument or expose a viewpoint. Key features of expository documentaries discussed include the use of narrators, scripts to structure the argument, reconstructions to retell the truth, interviews of eyewitnesses/experts, and mise-en-scene to advance the filmmaker's perspective. Examples like Nanook of the North are analyzed, though some of its scenes are now known to have been staged. The lines between documentary and fiction are also examined.