A prom queen or homecoming queen is a young woman who is elected to be, as the name suggests, queen of the prom. The prom queen is usually chosen by ballot by her fellow students, and any female student can be chosen.
The prom queen is partnered with a prom king who is elected in a similar manner. They both have a prom king and queen dance to celebrate their selection.
Fictional prom queens
References
Prom queen Wikipedia(Text) CC BY-SA