subgenre of horror films involving a violent psychopath stalking and murdering a group of people, usually by use of bladed tools
A slasher movie is a horror or thriller movie in which there is a killer hunting after a group of people, picking them off one by one. Often the killer has a powerful weapon, is crazy or insane, and is either unstoppable or cannot die. Common examples of slashers include: A Nightmare on Elm Street, Friday the 13th (1980 movie), Halloween (franchise) and Psycho (movie). Stephen King has written several slasher movies.