The Thai League is the top professional football league in Thailand, established in 1996. It features a competitive format with 16 teams that compete annually for the championship title. The league operates on a promotion and relegation system with the Thai League 2, allowing teams to move between divisions based on their performance. Matches are typically held from February to October, with each team playing 30 games in a round-robin format. The league has gained popularity and has contributed to the development of football in Thailand, attracting both local and international players and coaches.