Kim Tae-yeon (Korean: 김태연; born March 9, 1989), known mononymously as Taeyeon, is a South Korean singer. She debuted as a member of girl group Girls' Generation in August 2007, which went on to become one of the best-selling artists in South Korea and one of the most widely known K-pop groups worldwide. She has since participated in other SM Entertainment projects, including Girls' Generation-TTS, SM the Ballad, Girls' Generation-Oh!GG, and the supergroup Got the Beat.

In 2015, Taeyeon released her debut extended play (EP) I, whose titular single reached number one on South Korea's Gaon Digital Chart. In 2016, she released the number-one single "Rain" as part of the SM Station project, followed by her second EP Why, which peaked atop the Gaon Album Chart. Taeyeon's debut studio album, My Voice, was released in 2017 and yielded the top-five singles "11:11", "Fine" and "Make Me Love You". Taeyeon ventured into the Japanese music scene in 2018 with the digital single "Stay", followed by the 2019 EP Voice. Her second studio album, Purpose (2019), featured the number-one single "Four Seasons" and the top-5 single "Spark". Her third studio album INVU (2022) included the number-one titular single as well as top-10 singles "Weekend" and "Can't Control Myself".

On television, Taeyeon appeared on the reality shows We Got Married (2009) and Begin Again (2019) and hosted Queendom 2 (2022). She is currently a cast member of Amazing Saturday (2020–present). Additionally, Taeyeon has recorded soundtracks for various television dramas and films, including "If" for Hong Gil-dong (2008), "Can You Hear Me" for Beethoven Virus (2008), and the chart-topping "All About You" for Hotel del Luna (2019).

Having sold over one million physical albums and twenty million digital singles as of 2021, Taeyeon is one of the best-selling solo artists in South Korea. She has received various awards and nominations, including six Golden Disc Awards, six Seoul Music Awards, five Circle Chart Music Awards, three Melon Music Awards, and four Mnet Asian Music Awards.