Genre is an important way to categorize films based on similarities. It helps the film industry with marketing by identifying audience interest in particular genres. It also helps audiences understand what to expect from a film based on its genre. Each genre has common conventions - for example, horror films often feature dark settings, old houses, death, blood, and screaming. Romance films commonly include flowers, love letters, and upbeat music. Proper classification of films by genre benefits both the industry and viewers.