I don’t understand much about API or back-end and front-end.
Whenever I try to find out what Firebase is, I always get some complicated description involving front-end or something similar.
Is it a no-code/low-code builder?
Is it only a way to configure databases?
Does it have anything to do with web API or Sheets API?
Does it allow you to upload your app to google play store or apple store?
Is it completely free?