Okay kiddo, so you know how your bike has a place where you can attach your water bottle holder? That's called a "braze-on"! It's a special little spot on your bike frame where you can attach things like a water bottle holder or a rack for carrying your backpack or other things.
Braze-ons are important because they keep things securely attached to your bike without wobbling around or falling off. And because they're built right into the bike frame, you don't have to worry about them getting loose or breaking off like you might with something that's just strapped on.
So if you ever want to go for a long bike ride and need to bring some water or extra stuff with you, just find the braze-ons on your bike and attach your gear to them. Easy-peasy!