Racket sport is a term used to describe any sport that involves the use of a racket. Two popular examples of racket sports are SQUASH and TENNIS. SQUASH is a racquet sport played by two or four players in a four-walled court with a small, hollow rubber ball. TENNIS is a racquet sport played by two or four players in which a felt-covered rubber ball is struck with a strung racquet over a net into the opponent's court.