What are minecraft profiles?

So i play minecraft and stuff. But before i press play on the launcher to the left it says create a profile or edit a profile. The only one i have is my screen name. I decided to mess with it so i made a new profile and it had no worlds.So i wen't back to my old one and deleted the new one.I'm just wondering what profiles are for.People told me there were something about modding, Or in case you have siblings. And that you can change versions for modding, That sounds cool, but what do they exactly do?


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