90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
In the US, prom night is especially important to seniors(=students in their last year of high school). They buy expensive prom dresses or rent tuxedos(=formal men's suits), give corsages(=flowers you wear on your dress or jacket) to their dates(=person you ask to go with you to the dance), and sometimes ride to the prom in a rented limo(=very long, expensive car).