This document discusses genre categories in film including horror, thriller, action, comedy, romance, sci-fi, western, and war. It explains that genre boundaries can be flexible with genre hybrids combining elements of different genres, like Terminator 2 combining action, science fiction, and thriller. Genres have recognizable signs and symbols that audiences associate with anticipated story elements in a "generic memory". Romance films focus on the love story and relationships between main characters, while horror aims to elicit negative emotions from viewers. Back to the Future 3 and Terminator 2 are cited as examples of genre hybrids mixing elements from multiple categories.