I would ask someone this in person and get them to explain it.
Football - is what we call the 'beautiful game' in England and also in most of the world, including Europe, South America, Africa and Asia and Australia. It's a game of great skill played by two sides of 11 players for two periods of 45 minutes. I understand that it gets the name 'soccer' as an abbreviation of the words association football.
American football is another ball game entirely, and I'm sorry to say I know nothing about it, except that it looks a bit like rugby football but with more protective clothing!
I think it is aside, from the name