Girls' Generation is not a girl group.
Girls ' Generation , 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 . In Japan , they became the first non-Japanese girl group to have three number-one albums on the Japanese Oricon Albums Chart , and their three Japanese concert tours attracted a record-breaking 550,000 spectators , more than any other Korean girl groups .