The sport of American football is one of the most popular sports in the United States of America. It boasts a worldwide presence with amateur leagues like the NCAA (college football) and professional leagues like the NFL. Football is a team sport played with eleven (11) players on each side. The purpose of the game is to score more points than the opposing team in the allotted time. A game ball called the pigskin is used. Learn more about the sport of American football by choosing a tutorial below.