Prom dresses refer to formal gowns worn by female high school students in the United States for their prom, which is a semi-formal dance held at the end of the academic year. The prom is an important event in many American teenagers' lives and they often wear elaborate and expensive dresses for this occasion. Prom dresses come in various styles such as ball gowns, A-line dresses, mermaid dresses, etc., and are usually made from luxurious fabrics like satin or chiffon. The color, design, and style of prom dresses can vary greatly depending on the individual's taste and preferences.