Deftones is an American alternative metal band formed in Sacramento, California, in 1988. They were formed by frontman Chino Moreno, lead guitarist Stephen Carpenter and drummer Abe Cunningham, with bassist Chi Cheng and keyboardist and turntablist Frank Delgado joining the lineup in 1990 and 1999, respectively.

After the lineup settled in 1993, Deftones secured a recording contract with Maverick Records, and subsequently released their debut album Adrenaline in 1995. Extensive touring and word-of-mouth promotion of the album helped Deftones garner a dedicated fan base. Their second album, Around the Fur (1997), was certified platinum in the US. The band found further success with their third album White Pony (2000), which marked a transition from their earlier, more aggressive sound into a more experimental direction; its track "Elite" won the Grammy Award for Best Metal Performance. Their self-titled fourth album was released in 2003 and debuted at number 2 on the US Billboard 200. Deftones' fifth studio album, Saturday Night Wrist (2006) was marred by creative tensions and personal issues within the band, some of which influenced its material.

In 2008, while Deftones were working on an album tentatively titled Eros, Cheng was involved in a traffic collision. As a result, he was left in a minimally conscious state until his death in 2013 of cardiac arrest. After Cheng's accident, Deftones halted production on Eros and recruited Quicksand bassist Sergio Vega until his departure in early 2021. The band returned with Diamond Eyes in 2010, and their next three albums, Koi No Yokan (2012), Gore (2016) and Ohms (2020), all received widespread critical acclaim. In 2025, Deftones released their tenth studio album, Private Music, which became the band's most acclaimed album of their career, also charting in a career-high 26 countries.

When Stephen Carpenter was 15 years old, he was hit by a car while skateboarding. Confined to a wheelchair for several months, he began teaching himself to play guitar by playing along to songs by thrash metal bands such as Anthrax, Stormtroopers of Death, and Metallica. A long-circulated myth alleged that the driver paid Carpenter a cash settlement that allowed the band to purchase equipment, but Abe Cunningham commented in a 2007 interview that the story about the settlement was false.

Carpenter, Cunningham and Chino Moreno were childhood friends. All three went to C. K. McClatchy High School in Sacramento and remained friends through the city's skateboarding scene. Carpenter was a fan of heavy metal, and Moreno was interested in hardcore punk bands such as Bad Brains and post-punk and new wave bands such as Depeche Mode and the Cure. When Moreno found out that Carpenter played guitar, he set up a jam session with Cunningham, who played drums, and the three began playing regularly in Carpenter's garage around 1988. They recruited bassist Dominic Garcia some time after, and the band became a four-piece. When Cunningham left Deftones to join Phallucy, another band from Sacramento, Garcia switched to drums. Chi Cheng joined to play bass, and the band recorded a four-track demo soon afterwards. John Taylor replaced Garcia on drums in 1991, until Cunningham's return in 1993. Within two years, the band began playing club shows and later expanded their gigging territory to San Francisco and Los Angeles, where they played shows alongside bands such as Korn. While closing for another band in L.A., after the majority of the audience had left, the band impressed a Maverick Records representative. They were signed to the label after performing three of their songs for Freddy DeMann and Guy Oseary.

Carpenter created the band's name by combining the hip hop slang term "def" with the suffix "-tones". The name is also a pun on the term "tone deaf."

The band's debut album, Adrenaline, was recorded at Bad Animals Studio in Seattle, Washington and released on October 3, 1995. It was produced by Deftones and Terry Date, who would go on to produce the band's next three albums. While they were initially commercially unsuccessful, the band built a dedicated fan base through extensive touring, word-of-mouth and Internet promotion. Through their efforts, Adrenaline went on to sell over 220,000 copies. It is regarded as an important part of the 1990s nu metal movement. An early track which predated Adrenaline but did not make the album's final cut was "Teething"; the band contributed the song to the soundtrack for the 1996 film The Crow: City of Angels. The band can also be seen performing the song live during The Day of The Dead festival scene as themselves.

The album spent 21 weeks on the Billboard Heatseekers chart, reaching a peak position of 23. When asked what he attributed the album's success to, Cheng responded, "One word: perseverance. We've been together for almost eight years, on the road for two, and we do it with honesty and integrity—and the kids can tell". The album was certified gold by the RIAA on July 7, 1999, and was certified platinum on September 23, 2008.