Tennis is a popular sport played between two players (singles) or two teams of two players each (doubles). The game is played on a rectangular court divided by a net. Players use a racket to hit a ball over the net, aiming to land it within the opponent's court boundaries. Points are scored when the opponent fails to return the ball. The game is governed by a set of rules established by the International Tennis Federation. Major tournaments, such as Wimbledon and the US Open, attract global attention and showcase the skills of top players like Roger Federer and Serena Williams.