A boy band in pop, hip hop and R&B music, is loosely defined as a popular music act consisting of about 3-6 male performers. Despite the term "band", boy band members usually do not play musical instruments, either in recording sessions or on stage, although exceptions do exist.
Some such bands can evolve out of church choral or Gospel music groups, but are often created by talent managers or record producers who hold auditions. Due to this and their general commercial orientation towards an audience of preteens, teenyboppers, or teens, the term may be used with negative connotations in music journalism. Boy bands are similar in concept to girl groups. - Wikipedia
The term "boy band" came around in the 1990's. with the first commercially successful boy band being New Kids on the Block.
Some managers in Europe then created their own acts, Nigel Martin- Smith produced Take That, followed by Louis Walsh with East 17.
One of the most successful boy band mangers was Lou Pearlman, who founded Backstreet Boys and 'N Sync.
Since 2001, boy bands have began to fade, and no longer dominated the charts.
The commercial success of a boy band is often the groups image, this is done by the bands dress, promotional materials and music videos.
Each member of the group often has there own stereotypical personality trait such as "the bad boy" or "the baby."
The performance often includes dancing, with the members taking it in turns to sing. Boy bands generally do not write there own material.