HORROR

Horror is the feeling of revulsion that usually occurs
after something frightening is seen, heard, or otherwise experienced.

It is the feeling one gets after coming to an awful realization or experiencing a hideous revelation.
(Terror by contrast is usually described as the feeling of dread and anticipation that precedes the horrifying experience).

Horror has also been defined as a combination of terror and revulsion.
The distinction between terror and horror was first characterised by
the Gothic horror writer Ann Radcliffe. According to Devendra Varma in The Gothic Flame (1966):
"The difference between Terror and Horror is the difference
between awful apprehension and sickening realization:
between the smell of death and stumbling against a corpse."

Horror is also a genre of film and fiction that relies on horrifying images
or situations to tell stories and prompt reactions in their audiences.
In these films the moment of horrifying revelation is usually
preceded by a terrifying build up, often using the medium of scary music.

The Latin horrere is the root of words such as "horrific" or "horror";
it means "to stand on end" and refers to the standing hairs of goose bumps