Genre theory is used to categorize films based on stylistic criteria. Genres help audiences identify different types of films and cater to their expectations. Narratives describe a sequence of events and move the story along defined roles and plot points. Representation involves how media texts portray reality through intentional construction of signs and symbols. Audience theory examines how audiences receive and make meaning from media texts, either passively or actively engaging with them based on social and personal factors. Research and planning are required to systematically develop ideas and create goals for making a horror film, such as analyzing film techniques, planning plots, and selecting locations. Digital technologies, creative techniques, and post-production stages are also needed to produce a finished horror film or trailer.