Classified according to the main theme or characteristic:
Gore, where blood are predominates, violent scenes of mutilation, bloody murder, etc., that can arise in any situation that poses the film. Its extreme shape is coated with Ultra gore. Inside the Gore we find the films of Torture, which maintains the Gore characteristics but in a specific situation where there is at least one torturer and one tortured deprived of his freedom.
Horror comedy, where terror and violence mix with humor and sometimes ridicule, this type of horror film tries to give a little humor to the most violent events that may occur throughout the film. One of the main horror films of this is scary movie these contains the content of a normal horror movie but with a humor like a parody that causes not so much fear the scenes.
Exploit, where a particular feature is exploited in such a way that the development of the film abounds in certain images, winks and references to that characteristic. For example, the sex-exploit will cripple in scenes of nudity, rape, abuse, etc.
Class B, This classification refers to the resources available to make the film, denoting that the budget and production in general are second line. Beyond economic resources, some filmmakers cultivate a "B" visual line, so their films maintain a "second" aesthetic as a feature.
Rape and revenge, beyond the particularities of each script, the basic scheme is repeated: a woman raped and generally mistreated by more than one aggressor, revenge of the woman on the perpetrators. As an example, let's take the movie Kill Bill: in it the Bride is abandoned after a brutal attack in which she was considered dead. Revenge on the perpetrators is what occupies the bulk of the tape.
Slashed, these films are characterized by the presence of a murderer who is dedicated to hunting adolescents, generally isolated and without adult supervision. In these stories is common to find references or explicit scenes relating to sex, alcohol, usually among all the characters only one survives, the so-called "final girl" who is who seems to has a more complete understanding of the situation that arises, and demonstrates tenacity and courage to levels that the other characters do not reach.