Girls' Generation (Hangul: 소녀시대; So Nyeo Shi Dae), 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. Girls' Generation officially debuted on August 5, 2007 with its debut single "Into the New World" and subsequently gained some attention with their self-titled debut album. However, it was not until 2009 that they rose to prominence with the single "Gee", which claimed the top spot on KBS's Music Bank for a record-breaking nine consecutive weeks and was named the most popular song of the 2000s decade by Melon. The group solidified their place in the South Korean music industry with follow-up singles "Tell Me Your Wish (Genie)", "Oh!", and "Run Devil Run" from late 2009 to early 2010.