Tennis is a racket sport that is played either individually against a single opponent or between two teams of two players each . 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.

https://en.m.wikipedia.org/wiki/Tennis