Im Yoon-a (Korean: 임윤아; born May 30, 1990), also Im Yun-Ah, is a South Korean idol singer, dancer, actress and promotional model. Im Yoona made her debut as an actress in the 2007 drama, 9 Ends, 2 Outs. Yoona is currently a member of the popular Korean girl group Girls' Generation.
She is often referred to as the 'face' or 'center' of the group.
She was cast in 2002 SM Entertainment Saturday Open Casting Audition and began to train with the other trainees under SM Entertainment in the areas of acting, singing and dancing. Yoona trained with SM Entertainment for 5 years and later joined and debuted under Girls' Generation.

Real Name: 임윤아 (Im Yoona)
Stage Name: YoonA 윤아
Birth Date: May 30th, 1990
Height: 166 cm
Blood Type: B
Previous Works: TVXQ 'Magic Castle' M/V (2004), SANYO Eneloop CF (2006), TEUN TEUN English 'Follow Me' CF (2006), Super Junior 'U' M/V (2006), TSZX The Grace '열정 (My Everything)' M/V (2006), ELITE School Uniform CF (2007), HAITAI Beverage Sunkist 'Lemonade' CF (2007), Clean & Clear CF (2007), MBC Drama '9 Hits, 2 Outs' (2007)