A password hash is a representation of your password that can't be reversed, but the original password may still be determined if someone hashes it again and gets the same result.
Compare to:
A hash is like a fingerprint of your password. Your fingerprint tells me very little about you. You might be a man or a woman, tall or short, young or old. But if you show up, I can tell that you still have the same fingerprint. Likewise a hash doesn't tell me your password, but if my computer keeps guessing them, it can know when it is right. And my computer guesses really, really fast.
For the record I just asked my teenage son who doesn't know what a hash is whether he understood either explanation. He understood mine, but not Troy's. And he's a smart kid. If he doesn't understand an explanation, I'm pretty sure most adults won't either.