"Why" is a song recorded by South Korean singer Taeyeon for her second extended play of the same name. It was released as the EP's second single on June 28, 2016 by S.M. Entertainment. The song's lyrics were penned by Jo Yoon-kyung, while its music was composed by LDN Noise, Lauren Dyson, and Rodnae "Chikk" Bell. Musically, as opposed to Taeyeon's signature balladic styles, "Why" is described as a hybrid of EDM and R&B with elements of tropical house. The track's lyrics address a desire to escape a suffocating life.

The single received positive reviews from music critics, who were favorable towards the song's refreshing musical styles as well as Taeyeon's vocal performance. Commercially, "Why" peaked at number seven on South Korea's Gaon Digital Chart and reached number six on the Billboard World Digital Songs chart. As of December 2016, the song has sold 689,209 digital units in South Korea.

Two music videos for the song were released; the first one was directed by Im Seong-gwan and was premiered simultaneously with the release of the single. Filmed in California, the video depicts Taeyeon going on a trip to re-energize herself. The second one–a dance version featuring Taeyeon performing the choreography to the song was released on July 4, 2016. To promote "Why", Taeyeon held an event called "Countdown Night" prior to the song's release on Naver's V app. She also appeared and performed on music shows including Music Bank, Show! Music Core, and Inkigayo. The song was also included on the setlist of Taeyeon's concert Butterfly Kiss in South Korea in July and August 2016.

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