Girls' Generation (Hangul: 소녀시대; RR: Sonyeo Sidae), also known as SNSD, is a South Korean girl group formed by S.M. Entertainment. The group is composed of eight members: Taeyeon, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Yoona, and Seohyun. Originally a nine-piece group (with Jessica, who later departed from the group in September 2014), Girls' Generation debuted in 2007 with their Korean eponymous debut album.
They are the first Asian girl group to achieve five music videos with over 100 million views on YouTube: "Gee", "I Got a Boy", "The Boys", "Mr. Taxi", and "Oh!".