Slayer is an American thrash metal band formed in Huntington Park, California in 1981 by guitarists Kerry King and Jeff Hanneman. Slayer rose to mainstream fame with their 1986 release Reign in Blood, and is credited as one of the "Big Four" thrash metal acts, along with Metallica, Megadeth and Anthrax. Slayer's sales are in the estimated high 20 millions, although they have never publicly announced their sales worldwide. However, between the years 1991 and 2004, Slayer sold over 3.5 million albums in the U.S.

Slayer's musical style involve fast tremolo picking, double bass drumming, and shouted vocals. In the original line-up, King, bassist/vocalist Tom Araya and guitarist Jeff Hanneman contributed to the band's lyrics, and most of the band's music was created and arranged by King and Hanneman, with additional help from drummer Dave Lombardo and sometimes Araya. The band's lyrics and album art, which cover topics such as serial killers, necrophilia, Satanism, religion, anti-religion and warfare, have generated album bans, delays, lawsuits and criticism from religious groups and the public. Their music has been highly influential, often being cited by many bands as an influence musically, visually and lyrically.