Badminton is played between two players or teams using rackets to hit a shuttlecock back and forth over a net. A match consists of best-of-three games to 21 points, needing a 2-point lead unless the score reaches 29-30. The server alternates sides each point if the score is even or odd, and service passes to the opponent if a rally is lost. Faults result in a point for the opponent if service is incorrect or the shuttle touches outside the court, net, or body.