Girls' Generationis a nine-member South Korean girl group formed by SM Entertainment in 2007. The nine members are: Taeyeon (Leader), Jessica, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Seohyun, and Yoona. They are often referred to as SoShi or SNSD, the first of which is an abbreviation and the second, mainly used outside Korea, is an acronym of the group's Korean name So Nyuh Shi Dae