(Hangul: 소녀시대; Hanja: 少女時代; Mandarin Chinese: Shaonü Shidai; Japanese: Shōjō Jidai) is a South Korean nine-member girl group formed by SM Entertainment in 2007. Its members include (in order of official announcement) Yoona, Tiffany, Yuri, Hyoyeon, Sooyoung, Seohyun, Taeyeon, Jessica, and Sunny. They are commonly referred to as SNSD, the acronym of the group's Korean name So Nyeo Shi Dae or So Nyuh Shi Dae.
The members were professionally trained primarily in singing and dancing while a select few were also trained in acting and modeling. Many of the members had already made appearances in magazine ads, television commercials, and small television appearances. For nearly two years, Korean websites speculated about which female SM Entertainment trainees would be placed into the group. The was speculated to be called Super Girls after their counterpart Super Junior.
In July 2007, Girls' Generation had their first performance on Inkigayo. The song the girls performed was called "Into the New World" (Korean: "다시 만난 세계"), which became their first single. A show documenting the girls' debut titled M.Net's Girls Go To School was filmed during this time.
* Birth name: Kim Tae Yeon (Hangul: 김태연; Hanja: 金泰妍)
* Date of birth: March 9, 1989 (1989-03-09) (age 20)
* Birth name: Jessica Jung (Hangul: 제시카 정)
* Korean name: Jung Soo Yeon (Hangul: 정수연; Hanja: 鄭秀妍)
* Date of birth: April 18, 1989 (1989-04-18) (age 20)
Jessica was born and raised in San Francisco, California.
* Birth name: Lee Sun Kyu (Hangul: 이순규; Hanja: 李順圭)
* Date of birth: May 15, 1989 (1989-05-15) (age 20)
The niece of Lee Soo Man, Sunny was a trainee under a different company before transferring into SM Entertainment.
* Birth name: Stephanie Hwang
* Korean name: Hwang Mi Young (Hangul: 황미영; Hanja: 黄美英)
* Date of birth: August 1, 1989 (1989-08-01) (age 20)
Born in Los Angeles but raised in Diamond Bar, California, USA, she was discovered in the SM Starlight Casting System 2004 in Los Angeles.
* Birth name: Kim Hyo Yeon (Hangul: 김효연; Hanja: 金孝渊)
* Date of birth: September 22, 1989 (1989-09-22) (age 20)
Hyoyeon was featured in one of BoA's live concerts as a silhoutte dancer way back in 2005. She attended a hip-hop dance school that specialized in waving, popping, and locking. In 2004, along with labelmate Siwon, she traveled to Beijing, China to learn more about Chinese for four months.
* Birth name: Kwon Yu Ri (Hangul: 권유리; Hanja: 權侑利)
* Date of birth: December 5, 1989 (1989-12-05) (age 20)
Yuri played a part in the sitcom Unstoppable Marriage (Korean: 못말리는 결혼).
* Birth name: Choi Soo Young (Hangul: 최수영; Hanja: 崔秀英)
* Date of birth: February 10, 1990 (1990-02-10) (age 19)
* Birth name: Im Yoon A (Hangul: 임윤아; Hanja: 林潤娥)
* Date of birth: May 30, 1990 (1990-05-30) (age 19)
* Birth name: Seo Joo Hyun (Hangul: 서주현; Hanja: 徐珠賢)
* Date of birth: June 28, 1991 (1991-06-28) (age 18)