The Chilean Primera División is the top professional football league in Chile. Established in 1933, it features 16 teams competing annually for the championship. The league operates on a system of promotion and relegation with the Primera B, the second tier of Chilean football. Each season, teams play a series of matches, and the club with the most points at the end is crowned the champion. The league is known for its passionate fan base and has produced several notable players who have gone on to achieve international success.