Saving Data on Android

Firebase Realtime Database
 is a solution that stores data in the cloud and provides 
an easy way to sync your data among various devices. It is powered by the Google 
Firebase platform, and is just a single piece in an otherwise large puzzle. In this 
chapter, you'll learn how the Realtime Database works and its key capabilities. 
Furthermore, you'll add the Realtime Database to an Android project. Along the way 
you'll learn how the Realtime Database takes care of security with database rules, 
how data is saved to the database and the best practices for data structure.
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Overview
Firebase Realtime Database is a cloud-hosted database that supports iOS, Android, 
Web, C++ and Unity platforms.
Realtime
 means that any changes in data are reflected immediately across all 
platforms and devices within milliseconds. Most traditional databases make you 
work with a request/response model, but the Realtime Database uses