Tennis is a racket sport in that you use a tennis racket to hit the ball over the net into your opponent's side so that they cannot successfully return the ball. It can be played by a single person against a singular opponent, singles, or it can be played by two teams of two players, doubles. Tennis is an olympic sport, and can be played by those of any age and at any level of society.
Tennis is played by millions of players and is a popular spectating sport. There are many tournaments, both local and worldwide, that tennis players participate in yearly or even weekly. It is also an enjoyable spectating sport with an estimated 1.2 billion people that watch the sport.