Domestic leagues are competitions held within a specific country, where professional teams compete against each other. These leagues are often organized by sport, such as football, basketball, or hockey, and feature a regular season followed by playoffs or finals to determine the champion. Each domestic league typically has its own set of rules, regulations, and formats. Popular examples include the English Premier League for football and the NBA for basketball. Domestic leagues play a crucial role in developing local talent and fostering community support for teams.