لالیگا is the top professional football division in Spain, officially known as La Liga. It was founded in 1929 and features 20 teams competing annually for the championship title. The league is known for its high level of competition and has produced many world-class players and clubs. The most successful teams in لالیگا include Real Madrid and FC Barcelona, both of which have a rich history and a large fan base. The league operates on a system of promotion and relegation with the Segunda División, allowing for dynamic changes in team participation each season.