In the United States prom (short for promenade) is a formal (black tie) dance or gathering of high school students. It is typically held near the end of the senior year (i.e., the last year of high school). It figures 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".
In Britain, the terms formal and grad are most commonly used for occasions equivalent to the American "prom", and the event is usually held for those graduating high, secondary or middle school. However the term "prom" is becoming more common in the UK due to the influence of US TV shows and movies. In Ireland, the event is known as a debs (originally an abbreviation of debutante ball). Prom is a term which originally referred to outdoor concerts in London's pleasure gardens, where the audience was free to stroll around while the orchestra was playing. In fact this tradition has been revived in parks and stately homes around the UK at promenade concerts such as the Battle Proms.
I am so excited to share everything about Prom and I can't wait to do it.