Girls' Generation, also known as SNSD, debuted by SM Entertainment in 2007, quickly became a defining force in K-pop. The group initially had nine members: Taeyeon, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Yoona, Seohyun, and Jessica (who later left the group in 2014). Known for their groundbreaking hits like "Gee," "I Got a Boy," and "Into The New World," Girls' Generation set numerous sales and award records. They played a crucial role in spreading the Hallyu wave internationally, earning them the title "The Nation's Girl Group" and influencing countless artists in the industry.