The Irish Football League is the top tier of football in Northern Ireland, established in 1890. It features several clubs competing for the championship title each season. The league operates on a promotion and relegation system with the NIFL Championship, allowing teams to move between divisions based on their performance. The league consists of 12 teams that play each other twice, once at home and once away, in a round-robin format. The team with the most points at the end of the season is crowned the champion. The league is known for its passionate fan base and rich history in Irish football.