Saints signed Kicker Charlie Smyth (re-signed to 2 year deal)

Belfast Saint said

Gaelic football is not soccer. It does use a soccer ball, an there is a soccer goal. But otherwise, different. Not my game per se, but fun to watch.

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Why do they have what looks like a soccer ball in some shots and in other shots they're wearing helmets, carrying a stick and use a ball about the size of a softball in other shots?
Curious, because I know nothing about Gaelic football.