Horror is a genre of speculative fiction which is intended to frighten, scare, or disgust. Literary historian J. A. Cuddon defined the horror story as "a piece of fiction in prose of variable length... which shocks, or even frightens the reader, or perhaps induces a feeling of repulsion or loathing". It creates an eerie and frightening atmosphere. Horror is often divided into either the psychological horror and supernatural horror sub-genre. Often the central menace of a work of horror fiction can be interpreted as a metaphor for the larger fears of a society. Prevalent elements include ghosts, demons, vampires, werewolves, ghouls, the Devil, witches, monsters, dystopian and apocolyptic worlds, serial killers, cannibalism, psychopaths, cults, dark magic, Satanism, the macabre, gore, and t