The English Football League (EFL) is a league competition featuring professional association football clubs from England and Wales. Founded in 1888 as the Football League, the league is the oldest such competition in world football. It was the top-level football league in England from its foundation until 1992, when the top 22 clubs split away to form the Premier League.
The three leagues below the Premier League are known as the Championship, League One and League Two, normally with 24 clubs in each division (72 in total; in the 2019–20 season, League One was reduced to 23 following the expulsion of Bury). Promotion and relegation between these divisions is a central feature of the League and is further extended to allow the top Championship clubs to exchange places with the lowest-placed clubs in the Premier League, and the bottom clubs of League Two to switch with the top clubs of the National League, thus integrating the League into the English football league system. Although primarily a competition for English clubs, clubs from Wales – currently Cardiff City, Swansea City and Newport County – also take part, while in the past Wrexham, Merthyr Town and Aberdare Athletic have been members.