In badminton, the scoring system is primarily based on the rally point system, where points can be won by both the serving and receiving players. Matches are usually played in a best-of-three sets format, with each set played to 21 points. A player or a team must win by at least a two-point margin to claim a set. If the score reaches 20 to 20, however, the first player or team to reach 21 points must then achieve a two-point lead in order to win the set.