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Girls' Generation, also known as SNSDSouth Korea's National Girl Group, is a South Korean korean girl group formed by SM Entertainment. The group is composed of eight members: Taeyeon, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Yoona, and Seohyun. Originally a nine-piece group, Jessica departed from the group in September 2014. They debuted on August 5, 2007 with their first single ''"Into the New World"''.