'can i make a firebese model that has a user and the data of that user with authentication in that same document?

I am trying to make a db model on fire base but I didn't understand the user authentication quite yet in mongo db you can make a document that has all the user data like email for example and passwords in addition to that user data, but in firebase the user authentication is a separate data base , can i make users document that include users data and authentication with in the fire cloud db ? or at least can I connect AUTH and db together ?



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