Association football, commonly known as football or soccer, is the world's most popular sport, engaging an estimated 250 million players across over 200 countries and territories. Played by two teams of 11, the game's objective is to score goals by propelling a ball into the opponent's net, primarily using feet and other body parts, though only goalkeepers may use their hands within a designated area. The "Laws of the Game" were first established in 1863 by the Football Association (FA) in London, giving rise to the "association" in its name, while "soccer" emerged as Oxford slang from the same term. Governed internationally by FIFA, the sport features iconic competitions such as the FIFA World Cup, which is the most-viewed sporting event globally, and the prestigious UEFA Champions League.