Explain the scoring system in the game of badminton.

Scoring in badminton (rally point system): 1. A match is the best of three games, each played to 21 points. 2. A point is scored on every rally by the side that wins it, whoever served. 3. At 20 all, a side must lead by 2 points to win the game. 4. At 29 all, the side that scores the 30th point wins the game. 5. The side that wins a game serves first in the next game.