National Leagues are organized competitions in various sports, where teams from a specific country compete against each other. These leagues are typically structured with a regular season followed by playoffs, culminating in a championship. Examples include the National Football League (NFL) in American football and the National Basketball Association (NBA) in basketball. Each National League has its own set of rules, regulations, and schedules, which are designed to ensure fair play and competitive balance. Teams earn points or wins based on their performance, and the best teams qualify for postseason tournaments. This structure helps promote the sport and engage fans nationwide.