The Primeira Liga is the top professional football league in Portugal. Established in 1934, it features 18 teams competing annually for the championship title. The league operates on a system of promotion and relegation with the LigaPro, the second tier of Portuguese football. Each season, teams play 34 matches, facing each other twice, once at home and once away. The team with the most points at the end of the season is crowned the champion. The Primeira Liga is known for producing talented players and has a strong following both domestically and internationally.