Usually, it is a term used to define boy or girl bands. These groups are generally composed of young singers who are still in their teenage years at the time of formation.
They often dance in their music videos and live performances. And most of the time, the members don’t play musical instruments but, exceptions do exist.
They can be formed on their own. However, in most of the cases, they are created by talent managers or record producers holding auditions.
e.g. One Direction, Fifth Harmony, Little Mix, Backstreet Boys, N*Sync, Take That, Sugababes, Girls Aloud, Jackson Five, The Beatles, The Pussycat Dolls, etc.