What is Firebase?
To understand what is Firebase let's open its website https://firebase.google.com/. This is what we see:

Google Firebase landing page
Firebase for Google is yet another cloud service, like AWS for Amazon or Azure for Microsoft, a bit simpler though, because Google already has Google Cloud Platform, which is huge.
If you feel like you want to choose between Firebase and AWS, do not forget that you will most likely Google it. In any case, someone has already done this for you so here you have this question on Quora at https://www.quora.com/Which-is-better-cloud-server-Amazon-AWS-or-Firebase.
I would say that it's more similar to Heroku—it allows you to easily deploy your applications and integrate them with analytics tools. If you have read the Learning Vue.js 2 book (https://www.packtpub.com/web-development/learning-vuejs-2), then you already know how much I love Heroku. I even have Heroku socks!

My beautiful Heroku socks
However, I find Google Firebase console...