A Baseball League is an organized group of professional or amateur teams that compete against each other in the sport of baseball. These leagues can vary in size and structure, often featuring a regular season followed by playoffs to determine a champion. Teams typically represent cities or regions and play a series of games throughout the season. In many countries, such as the United States, the most prominent Baseball League is Major League Baseball (MLB), which consists of two main divisions: the American League and the National League. Other countries also have their own leagues, such as the Nippon Professional Baseball in Japan and various minor leagues that develop talent for higher levels of play.