Correct Answer is: Offline inventory database
The Data Import feature allows you to upload information from external sources and combine it with the data you collect through Analytics. You can use Analytics to organize and analyze all your data in the way that best suits your business.
Google Analytics data collection for Firebase
The type of information that is collected by the default implementation of Google Analytics for Firebase includes the following:
Number of users and sessions
Duration of the session
Initial execution of the application
Number of times the application is opened
Direct purchases from the application
See a full list of user properties and default events that are collected in Google Analytics for Firebase.