Tournament formats are the structured ways in which competitions are organized. Common formats include single elimination, where a team is out after one loss, and round-robin, where each participant competes against all others. These formats help determine a winner efficiently and fairly, depending on the number of participants and the time available. Another popular format is the double elimination, which allows teams to lose once and still have a chance to win the tournament. Additionally, some tournaments use a Swiss system, where participants are paired based on their performance, ensuring that everyone plays a set number of matches. This variety helps cater to different types of competitions, from sports to esports.