"Closer" is a song by American DJ duo the Chainsmokers featuring American singer Halsey. Andrew Taggart also provides his vocals in the song, which was a first. It was released on July 29, 2016, through Disruptor Records and Columbia Records. The song was written by Taggart, Halsey, Shaun Frank, Freddy Kennett, Isaac Slade and Joe King. Halsey's vocals were produced by DJ Swivel, while the main song production was handled by the Chainsmokers as usual. Musically, it is a future bass and pop song with a "retro" style synthesizer in the chorus. Taggart and Halsey take turns singing their parts before singing the chorus together as the song concludes.

The Chainsmokers are an American electronic DJ and production duo consisting of Alexander "Alex" Pall and Andrew "Drew" Taggart. They started out by releasing remixes of songs by indie artists. The EDM-pop duo achieved a breakthrough with their 2014 song "#Selfie", which became a top-twenty single in several countries. They have won a Grammy award, two American Music Awards, seven Billboard Music Awards and nine iHeartRadio Music Awards. According to Forbes 2019 list of highest-paid celebrities, the Chainsmokers were the highest-paid DJs, dethroning Calvin Harris after six years.