It's essentially an API to access a streamlined database, file hosting, access provider and so on. Everything integrated and can talk to each other.
Not long ago I got fed up with endless tools and configuration in the LAMP/MEAN/MERN or whatever the latest trend is to put data somewhere and read it, so I got into native iOS development and I am loving it.
On the client-side, I have only two UI frameworks to deal with(UIKit and SwiftUI). On the backend side, I only deal with Firebase. You can do everything with those.
Honestly, I don't know why not all providers are essentially like Firebase. Surely for some scenarios, a custom solution would be needed but it strikes me as Firebase being the place that provides the structure and you plug your custom software to it.
That's why I am under the impression that at the end the gold rush for the cloud, the result would be something like Firebase.
What I would love though, if an open source self hostable Firebase alternative.