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. These series are typically part of a larger postseason tournament and can vary in length, often consisting of a best-of-five or best-of-seven format. The team that wins the majority of games in the series is declared the winner. In many professional sports, such as NBA basketball and NHL hockey, playoff series create high-stakes competition, as teams strive to showcase their skills and teamwork. The excitement of these series draws in fans and can lead to memorable moments in sports history.