Professional leagues are organized competitions where teams or individuals compete in sports for recognition, trophies, and often financial rewards. These leagues feature skilled athletes who have made sports their career, showcasing their talents in front of fans. Examples include the National Football League (NFL) for American football and the National Basketball Association (NBA) for basketball. In professional leagues, teams are usually divided into divisions or conferences, and they play a set number of games each season. The best teams often qualify for playoffs, leading to a championship game where the ultimate winner is crowned. This structure creates excitement and rivalry among teams and their supporters.