Football is a sport that uses a ball made of leather and is played by two teams, each consisting of 11 (eleven) and most of the core players bench.
Entering the 21st century, this sport has been played by over 250 million people in 200 countries, making it the most popular sport in the world.
Football aims to score as much as possible by using the ball into the opposing goal. Football is played in a rectangular court, on grass or artificial turf. In general, only goalkeeper who has the right to touch the ball with hand or arm in the area of the net, while 10 (ten) other players are allowed to use the entire body other than the hands, usually with the legs to kick, to control chest, and head for the ball. The team that scored the most goals at the end of the game is the winner. If the until time expired still end in a draw, then it can be done the draw, extra time and penalties, depending on the format of implementation of the championship.
General game rules are updated each year by the international football governing body (FIFA), which also organizes the World Cup every four years.