The Premier League is the top level of the English football league system. Contested by 20 clubs, it operates on a system of promotion and relegation with the English Football League (EFL). The Premier League is a corporation in which the member clubs act as shareholders. Seasons run from August to May with each team playing 38 matches (playing each other home and away). Most games are played on Saturday and Sunday afternoons. It is often known outside England as the English Premier League (EPL).