라리가, officially known as the Primera División, is the top professional football league in Spain. It features 20 teams competing annually for the championship title. Established in 1929, 라리가 is known for its high level of competition and has produced some of the world's best football clubs, including FC Barcelona and Real Madrid. The league operates on a promotion and relegation system with the Segunda División. Each season, teams play 38 matches, facing each opponent twice, once at home and once away. The team with the most points at the end of the season is crowned the champion, while the bottom three teams are relegated to the lower division.