"This Is What You Came For" is a song written by Taylor and produced and recorded by Scottish DJ and producer Calvin Harris, featuring Barbadian singer Rihanna. The song was released on 29 April 2016 through Sony Music and Westbury Road. Rihanna and Harris had previously collaborated on her sixth studio album, "Talk That Talk", which included the international chart-topper "We Found Love" and US top five single "Where Have You Been", the former of which was written and produced by Harris. He played the final version for Rihanna at the 2016 Coachella Music Festival.

The single debuted at number two on the UK Singles Chart. It peaked at number three on the US Billboard Hot 100, becoming Rihanna's 21st top-five song and Harris's second; the song is currently Harris's highest peaking single as a lead artist. It also reached number one on the US Hot Dance/Electronic Songs, became the 12th number one for Rihanna and Harris's tenth on sister chart Dance/Mix Show Airplay. and became Rihanna's 25th and Harris's fourth chart-topper on the Dance Club Songs. It topped the charts in Australia, Canada, and the Republic of Ireland and peaked within the top ten of the charts in Germany, New Zealand and Switzerland.

"This Is What You Came For" received mixed reviews from critics; while some praised them for creating a catchy track, others labeled it as boring, and cited Rihanna's vocals as overprocessed. A music video for the song premiered on 17 June 2016 and features Rihanna in an open cube with images projected on the inside walls.

WRITING AND RELEASE

Harris and Nils Sjöberg were credited as the song's writers. On 13 July 2016, TMZ reported that the track was co-written with Harris's then-girlfriend Taylor Swift, who used the pseudonym Nils Sjöberg because they did not want their relationship to overshadow the song. The track became a point of contention upon its release, when Harris - in response to being asked about the possibility of collaborating with Swift during an interview with Ryan Seacrest - said that he "can't see it happening." Harris also took to his Twitter account to confirm that Swift wrote the lyrics and contributed some vocals, while he "wrote the music, produced the song, arranged it and cut the vocals", and also confirming her previous request for secrecy as co-songwriter. The credit has since been officially changed to "Taylor Swift" in BMI's and ASCAP's entry for the song. Swift also has uncredited vocals on the song.

Taylor Swift performed "This is What You Came For" on the piano for the first time live at the United States Grand Prix in Austin, Texas on October 22, 2016. Swift then performed an acoustic guitar version at the DirecTV "Super Saturday Night" in Houston, Texas on February 4, 2017.