Horror is a movie genre first seen after the Second Global war. It is designed to "Scare" the watcher. The Genre wasn't popular at first, But the industry hit a boom after writer Alfred Hitchcock released Psycho, and soon Birds, in the 70s. The Industry hit its peak in the 80s and 90s, with the releases of the Exorcist, Halloween and Nightmare on Elm Street. Since then, a lot of similarly made horror movies have been made, and it is one of the leading sales in movies.