A Sports team is a group of individuals who play sports, usually team sports, on the same team. Historically sports teams and the people who play sports have been amateurs. However, by the 20th century, some sports teams and their associated leagues have become extremely valuable with net worth in the millions. Real Madrid is rated by Forbes as the world most valuable sports team at $3.26 billion USD. Some individual sports have modified rules that allow them to be played by teams.