The most beautiful feature of Google Firebase is that it gives you a lot of functionalities out of the box, without you having to develop or having to complete a solution. For example, identity management is integrated, and security is out of the box, particularly security for the user and the ability of each user to see his data.
I also like that Google Firebase has a really good performance and is comparable to MongoDB. It's on the same level, and sometimes, it's on an even higher level than MongoDB.
Other functions that Google Firebase has that I find valuable include information dissemination, mail automation, and SMS, available out of the box.
Another valuable feature of the solution is that it allows you to develop some functionalities on the server side, so you can write JavaScript functions on the server side and use those functions quite easily. Google Firebase gives you almost a full backend environment out of the box without you having to do any deployments or a lot of administration because all administration is given out of the box.
