For most people around the world, football means just what the word suggests: a sport played primarily with the feet in which the ball is rarely touched with the hands.

But there is, of course, another version of football — actually derived from rugby — that is wildly popular in the U.S., in which the ball is touched with the feet only a few times in a game.

Welcome to American football. While it isn't as well known around the world as its American cousins baseball and basketball, football is growing in popularity, and the International Federation of American Football now has federations in 64 countries.