The document discusses the purpose of opening title sequences (OTS) in films. An OTS introduces the cast, crew, plot, and location/setting of the film. It aims to get the audience excited and help them understand the story. Examples are provided of OTS's for several films like Juno, Girl with the Dragon Tattoo, Skyfall, Forrest Gump, Hostage, and Flubber. Specific techniques used in each OTS like music, imagery, credits, and linear/non-linear structure are described to convey mood, foreshadow events, and set expectations around the film.