In a match of badminton, a winning score is determined by a player or team reaching 21 points before their opponent, provided they maintain a lead of at least two points. The game may require a third set if both players are tied at 20 points, and the match could extend to a maximum of 30 points. Points are scored through rallies, and the first to reach the designated score wins the game. This scoring system encourages competitive play and strategy, making every point essential to securing victory in badminton matches.