The Brasileirão, officially known as the Campeonato Brasileiro Série A, is the top professional football league in Brazil. It features 20 teams competing annually, with each team playing 38 matches in a round-robin format. The league typically runs from May to December, culminating in a champion based on total points. The Brasileirão is known for its high level of competition and has produced many talented players who have gone on to achieve international success. The league also serves as a pathway for clubs to qualify for prestigious tournaments like the Copa Libertadores and the Copa do Brasil.