Slasher film
A slasher film is a subgenre of horror films involving a killer or a group of killers stalking and murdering a group of people, often by use of bladed or sharp tools. Although the term "slasher" may occasionally be used informally as a generic term for any horror film involving murder, film analysts cite an established set of characteristics which set slasher films apart from other horror subgenres, such as monster movies, splatter films, supernatural and psychological horror films.