Football is a popular sport that involves kicking a ball to score goals. The history of football dates back to ancient China, Greece and Rome where early versions of the sport were played. In the 19th century, modern football codes were established in England including the rules and dimensions of the pitch. Today, there are several versions of football played globally including association football, futsal, beach soccer and Paralympic football. Major international competitions include the FIFA World Cup which is held every four years involving 32 national teams.