system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why the creators of American Football named their sport "Football" when there was already a much more popular sport with that name?
gpt
"Football" refers to an entire *class* of games.  Specifically, games played with a ball while the players are on foot (as opposed to being mounted on horses).  Different regions have different types of football that are popular.  From wikipedia:

>[A]ssociation football (also known as soccer) in the United Kingdom and most of the non-English speaking world; gridiron football (specifically American football or Canadian football) in the United States and Canada; Australian rules football or rugby league in different areas of Australia; Gaelic football in Ireland; and rugby football (specifically rugby union) in New Zealand. These different variations of football are known as football codes.