f(x) or
F(x) (;
Korean: ) is a
K-pop girl group formed by
S.M. Entertainment in 2009. The group is composed of four (formerly five) members:
Victoria,
Amber,
Luna and
Krystal. They have been recognized as "the most reliably risk-taking act in K-Pop" due to their experimental fashion and their eclectic,
electropop sound. Each member has also participated in other forms of entertainment, such as acting and television hosting.