Serie A is a professional league competition for football clubs located at the top of the Italian football league system and has been operating for over eighty years since the 1929–30 season. It had been organized by Lega Calcio until 2010, but a new league, the Lega Serie A, was created for the 2010–11 season. Serie A is regarded as one of the best football leagues in the world and it is often depicted as the most tactical national league.
For most of Serie A's history, there were 16 or 18 clubs competing at the top level. Since 2004–05, however, there have been 20 clubs altogether.
During the league, from August to May, each club plays each of the other teams twice; once at home and once away, totaling 38 games for each team by the end of the season.