In its current format, the Italian Football Championship was revised from having regional and interregional rounds, to a single-tier league from the 1929–30 season onwards. The championship titles won prior to 1929 are officially recognised by FIGC with the same weighting as titles that were subsequently awarded. However, the 1945–46 season, when the league was played over two geographical groups due to the ravages of WWII, is not statistically considered, even if its title is fully official. All the winning teams are recognised with the title of Campione d'Italia ("Champion of Italy"), which is ratified by the Lega Serie A before the start of the next edition of the championship.
The league hosts three of the world's most famous clubs as Juventus, Milan and Internazionale, all founding members of the G-14, a group which represented the largest and most prestigious European football clubs since 2000 to 2008, being the first two cited also founding members of its successive organisation, European Club Association (ECA). More players have won the coveted Ballon d'Or award while playing at a Serie A club than any league in the world other than Spain's La Liga.  – although Spain's La Liga has the highest total number of Ballon d'Or winners. Juventus, Italy's most successful club of the 20th century and the most successful Italian team, is tied for fourth in Europe and eighth in the world with the most official international titles. The club is also the only one in the world to have won all possible official confederation competitions. Milan is joint third club for official international titles won in the world, with 18. Internazionale, following their achievements in the 2009–10 season, became the first Italian team to have achieved a treble. Inter are also the only team in Italian football history to have never been relegated. Juventus, Milan and Inter, along with Roma, Fiorentina, Lazio and Napoli, are known as the Seven Sisters of Italian football.[note 1]
Serie A is one of the most storied football leagues in the world. Of the 100 greatest footballers in history chosen by FourFourTwo magazine in 2017, 42 players have played in Serie A, more than any other league in the world. Juventus is the team that has produced the most World Cup champions (25), with Inter (19), Roma (15) and Milan (10), being respectively third, fourth and ninth in that ranking.
Serie A, as it is structured today, began during the 1929–30 season. From 1898 to 1922, the competition was organised into regional groups. Because of ever growing teams attending regional championships, the Italian Football Federation (FIGC) split the CCI (Italian Football Confederation) in 1921. When CCI teams rejoined the FIGC created two interregional divisions renaming Categories into Divisions and splitting FIGC sections into two North-South leagues. In 1926, due to internal crises, the FIGC changed internal settings, adding southern teams to the national division, ultimately leading to the 1929–30 final settlement. No title was awarded in 1927 after Torino were stripped of the championship by the FIGC. Torino were declared champions in the 1948–49 season following a plane crash near the end of the season in which the entire team was killed.
In April 2009, Serie A announced a split from Serie B. Nineteen of the twenty clubs voted in favour of the move in an argument over television rights; the relegation-threatened Lecce had voted against the decision. Maurizio Beretta, the former head of Italy's employers' association, became president of the new league.
In April 2016, it was announced that Serie A was selected by the International Football Association Board to test video replays, which were initially private for the 2016–17 season, allowing them to become a live pilot phase, with replay assistance implemented in the 2017–18 season. On the decision, FIGC President Carlo Tavecchio said, "We were among the first supporters of using technology on the pitch and we believe we have everything required to offer our contribution to this important experiment."