In the United States, and increasingly in the United Kingdom and Canada, prom is a formal (black tie) dance or gathering of high school students. This event is typically held near the end of the senior year (the last year of high school). Proms figure greatly in popular culture and is a major event among high school students. High school juniors attending the prom may call it "junior prom" while high-school seniors may call it "senior prom" or "senior ball". In practice, this event may be a combined junior/senior dance.

A prom (in the United States) is a formal social event – usually a dance – generally held near the end of the last two years of high school.