What is "firestore"

The Cloud Firestore is a Nosql database with a proposal to be flexible and scalable for mobile, web and server development from the Firebase and of Google Cloud Platform.

Like the Firebase Realtime Database, keeps your data in sync in client applications through listeners in real time. Provides offline support for mobile and web devices for responsive applications that work regardless of network latency or Internet connectivity.

Cloud Firestore also integrates with other Firebase and Google Cloud Platform products, including Cloud Functions.