The League of Ireland Premier Division is the top tier of professional football in the Republic of Ireland. Established in 1985, it features clubs from across the country competing for the championship title. The league operates on a promotion and relegation system with the League of Ireland First Division, allowing teams to move between the two divisions based on their performance. The season typically runs from February to October, with each team playing 36 matches. The club with the most points at the end of the season is crowned the champion. Notable teams in the league include Shamrock Rovers and Cork City.