In film theory, genre refers to the method of film categorization based on similarities in the narrative elements from which films are constructed. Most theories of film genre are borrowed from literary genre criticism. As with genre in a literary context, there is a great deal of debate over how to define or categorize genres.

Besides the basic distinction in genre between fiction and documentary, film genres can be categorized in several ways.
Fictional films are usually categorized according to their setting, theme or, mood,

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