Okay kiddo, have you ever seen the Irish flag with the green, white, and orange stripes? Well, the Saint Patrick's Saltire is a special symbol that is part of that flag. It looks like a big X that goes right through the middle of the flag.
Now, let's talk about Saint Patrick. He was a man who lived a really long time ago in Ireland. And he did some pretty important things, like bringing Christianity to the people of Ireland.
Fast forward a bit, and people wanted to honor Saint Patrick and his accomplishments. So, they used his name and his symbol (the saltire) to create the Irish flag. The flag wasn't officially adopted until many years later, but it has since become a very important symbol for the people of Ireland.
So, when you see that big X on an Irish flag, just remember that it's called the Saint Patrick's Saltire and it's there to honor a very important man and his contributions to Ireland.