Is There a Collection and Document Model?

Fire base was out before graphuel. And i thought they had some sort of playground that was a similar in nature. But there's nothing that i'm aware of, but that's not to say it doesn't exist. It uses like a collection and document model. So you might have a user's collection, and you click on one user, which will open your user's document. You click on the blood post collection, and then you've got ta whole bunch of blog post documents. That's basely how that structured, cod of using a document model. I feel like i would have stumbled across that.