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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.

Critics cite psychological horror films such as Peeping Tom (1960) and Psycho (1960) and the Italian giallo films as early influences. The genre hit its peak between 1978 and 1984 in an era referred to as the "Golden Age" of slasher films. Notable slasher films include Black Christmas (1974), The Texas Chain Saw Massacre (1974), Halloween (1978), Friday the 13th (1980), My Bloody Valentine (1981), Sleepaway Camp (1983), A Nightmare on Elm Street (1984), Child's Play (1988), Candyman (1992), Scream (1996), I Know What You Did Last Summer (1997), Urban Legend (1998) and Terrifier (2016). Many slasher films released decades ago continue to attract cult followings. The slasher canon can be divided into three eras: the classical (1974–1993), the self-referential (1994–2000) and the neoslasher cycle (2000–2013).