These simplified baseball rules provide a very basic summary of baseball rules as well as the basics of softball rules. A complete summary of the rules is on the baseball page. A single game is played by two teams, who, during the course of a game, alternate playing offense and defense. A "season" is played over the course of many months by a group of teams, called a league. Each team in the league plays all the other teams in the league a fixed number of times, though it is not always in round robin format. At the end of the season, the team with the most wins is the winner of the regular season.