Girls' Generation (Korean: , RR: Sonyeo Sidae), also known as SNSD, is a South 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 ensemble, Jessica departed from the group in September 2014. Among the prominent South Korean figures and most popular K-pop groups worldwide, Girls' Generation has earned numerous accolades and the honorific nickname 'The Nation's Girl Group' in their home country. Girls' Generation debuted on August 5, 2007, with the single 'Into the New World' from their eponymous Korean album. The group rose to fame in 2009 with the single 'Gee', which claimed the top spot on KBS's Music Bank for a record-breaking nine consecutive weeks and was Melon's most popular song of the 2000s decade. The group consolidated their popularity in Asia with follow-up singles 'Genie', 'Oh! ', and 'Run Devil Run', which were released between mid-2009 and early 2010. Their second Korean studio album, Oh! (2010), won the Golden Disc award for Album of the Year (Disk Daesang), making the group the first and only female act to win the Album Daesang. Girls' Generation ventured into the Japanese music scene in 2011 with their eponymous Japanese album, which became the first album by a non-Japanese girl group to be certified million by the RIAJ. The group's third Korean studio album, The Boys, was the best-selling album of 2011 in South Korea.