라 리가, officially known as the Primera División, is the top professional football league in Spain. It features 20 teams that compete annually for the championship title. Established in 1929, 라 리가 is known for its high level of competition and has produced many world-class players and clubs. The league operates on a system of promotion and relegation with the Segunda División. Each season, the teams play 38 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, while the bottom teams are relegated to the lower division.