There are many different kinds of courts, like grass, clay or hard court. The goal of tennis is to hit the ball over the net into the other player’s court. When the other player cannot return the ball, a point is won. The game is played with two or four people. When it is played with two people, it is called “singles”, and when it is played with four people, it is called “doubles”. The court has "alleys" on each side, which are "fair" territory when playing doubles.