Thai League 1 is the top professional football league in Thailand. Established in 1996, it features 16 teams competing annually for the championship. The league operates on a system of promotion and relegation with the Thai League 2, ensuring a competitive environment. Matches are typically held from February to October, with each team playing 30 games in a round-robin format. The league is known for its passionate fan base and has produced several talented players who have gone on to represent Thailand in international competitions.