Film genres can be categorized based on similarities in narrative elements, emotional responses, subgenres that have emerged like docufiction, or hybrid genres like horror-comedy films. Standard characters and filmmaking techniques are associated with different genres. Genres also influence how films are marketed and organized. Beyond narrative elements, films can also be classified by their setting, theme, mood, format, target audience or production budget. Genre expectations and discourses shape genres over time as they change and evolve.