Football, also known as soccer, is the world's most popular sport played between two teams of 11 players. The objective is to score more goals than the opposing team by kicking or heading a ball into their net. It is governed by FIFA and played professionally by millions worldwide with billions more watching on television. Some key rules include using only feet, legs or head to control the ball and only goalkeepers can handle the ball within their own penalty area. The sport evokes strong passions among fans and communities around the world.