Roller derby is a contact sport played on roller skates, typically on an oval track. Teams consist of five players each, with one designated as the jammer who scores points by lapping opposing players. The game is fast-paced and combines elements of strategy, teamwork, and physical endurance. Matches are divided into periods called jams, lasting up to two minutes. Players use speed and agility to navigate through the pack of opponents while trying to avoid being blocked. Roller derby is known for its inclusive atmosphere, welcoming participants of all genders and skill levels, making it a unique and vibrant sport.