Horror fiction is a genre of literature, and film which is intended to, or has the capacity to frighten, scare, disgust, or startle their readers or viewers by inducing feelings of horror and terror. Literary historian J. A. Cuddon has 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 frequently supernatural, though it can be non-supernatural. Often the central menace of a work of horror fiction can be interpreted as a metaphor for the larger fears of a society.