Girls' Generation is a South Korean nine-member girl group formed by SM Entertainment in 2007. The members include (in order of official announcement) Yoona, Tiffany, Yuri, Hyoyeon, Sooyoung, Seohyun, Taeyeon (the leader), Jessica, and Sunny. International Girls' Generation fans usually refer to the group as SNSD, the acronym of the group's Korean name So Nyeo Shi Dae. Many of the members had already pursued an entertainment career before Girls' Generation's debut through acting, DJ-ing, and modeling.

(Source: Wikipedia )