Badminton is a racquet sport played by two opposing players or pairs who hit a shuttlecock over a net. Players score points by striking the shuttlecock so it passes over the net without being hit more than once. The unique aerodynamic properties of the feathered shuttlecock cause it to decelerate rapidly compared to balls. Badminton is played indoors to avoid effects of wind on shuttlecock flight. Equipment includes lightweight shoes, racquets, and feathered or synthetic shuttlecocks. Proper form and footwork are important for safety and effective movement on court.