Kim Hyo-yeon (Hangul: 김효연; born September 22, 1989), referred to as Hyoyeon or DJ HYO, is a South Korean singer, dancer, DJ, and television personality. She debuted as a member of the girl group Girls' Generation (and later its subgroup Girls' Generation-Oh!GG) in August 2007, which went on to become one of the best-selling artists in South Korea and one of South Korea's most popular girl groups worldwide. Since 2016, she has also released singles as a solo artist.