Films are often divided into genres, which describe the typical subject matter -- what the film is about. This is distinct from film styles, which describes filmic conventions which can be applied to any genre. Of course, the more that genres are defined, the more likely that a filmmaker will try to combine, transcend and evade categories, so not every film can be neatly labeled.
... in the United States assumed at the time that the term "flapper" derived from a fashion of wearing galoshes unbuttoned so that they flapped as the wearer walks, the term ...