The document discusses trailer teasers and their purpose. It notes that teaser trailers tend to be around 30 seconds and show a small amount of plot details, characters, and what may happen. They are meant to intrigue viewers and show the film being advertised. The document then analyzes the Official Mandela: Long Walk to Freedom UK Teaser Trailer based on common elements found in teaser trailers, such as showing the distributors at the beginning, including a voiceover to provide context about the plot, and revealing the film title at the end.