Tennis is a racket sport that is played either individually against a
single opponent (singles) or between two teams of two players each
(doubles). Each player uses a tennis racket that is strung with cord to
strike a hollow rubber ball covered with felt over or around a net and
into the opponent's court. The object of the game is to manoeuvre the
ball in such a way that the opponent is not able to play a valid return.
Learn more on Wikipedia 🔎