The document discusses the genre of science fiction films and the conventions found in their trailers. It defines a sci-fi film as one depicting speculative science-based phenomena not accepted by mainstream science, such as extraterrestrial life or advanced technology like robots and space travel. Sci-fi trailers often feature helicopters, lasers, fantasy creatures, battles, aliens, monsters, spacecraft, planets, adventures, fires, and destruction set in a future time period. While analyzing the conventions, the author realizes recreating these elements for a quality sci-fi trailer would be difficult without access to sophisticated software and resources needed for extensive special effects, costumes, and large casts.