FILM GENRE
Categories into which films can be placed based on, plotline, binary characters, style , iconography etc .
Film genre can determine whether a person does or does not go and see a movie download it or buy the dvd this makes it an increasingly important aspect of the film industry. Making a film in a specific genre creates specificity in the targeting of audience which in turn can increase revenue for a variety of reasons. Once a film is branded as a specific genre someone might go and see it because generally they like that genre, the producers can tailor the film they are creating to fit audience expectation so the filmgoers are not dissapointed and will buy into the movie and even the merchendise that is promoted around it.
Genres in film making have been critisised in the past as some people argue that the categorising of films devalues the art of film making. This can be validated to some extent , in its most brutal form splitting films into basic genre's (fantasy,horror,rom com action)  does make film less of an art form as binary plotlines are produced and films in some genre's become "samey" and the substance of the film is lessened .
This film "de ja vu" is however not always a bad thing .Often the audience buys into a film for the escapism from everyday life and knowing that the romantic comedy will end happily ever after or that the good guy wins out in an action film is a part of this   and creates audience satisfaction.Which is what producers aim for as a rule because , tailor making films for an audience makes more money.