A playoff series is a set of games played between two teams in a sports league to determine which team advances to the next round or wins the championship. Each series typically consists of a predetermined number of games, often best-of-five or best-of-seven, meaning the first team to win that number of games is declared the winner. During a playoff series, teams compete in a high-stakes environment, with each game being crucial for their chances of success. The series format allows for teams to adjust their strategies based on previous games, making it an exciting and competitive experience for players and fans alike.