What do you know about girls generation?

Girls' Generation (Korean: 소녀시대; Sonyuh Shidae) is a South Korean girl group formed by S.M. Entertainment in 2007.^[1][2] They are also referred to as SoShi (소시) or SNSD, both abbreviated forms of the group's Korean name, and are known in Japan as Shoujo Jidai. The nine member group consists of Taeyeon, Jessica, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Yoona and Seohyun.

They gained attention at the beginning of their career with songs such as "Into the New World" and "Kissing You" but it was not until 2009 when they gained significant popularity with their hit single "Gee", which would be named as South Korea's 'Song of the Decade'.^[3] The group solidified their place in the Korean music industry with follow-up singles "Tell Me Your Wish", "Run Devil Run", and "Oh!".
Here is the video of the song GEE, one of the most famous singles.

 In 2011, they returned to the Korean music scene with "The Boys", which was released in three languages: Korean, Japanese, and for the first time, English. They sold over 100,000 copies for each of their six Korean releases, making them the first female group in the South Korean music industry to do so in over six year.