SharedPreferences allow us to save or store variable values in memory after app destroyed. Using this way you can keep values of variable even if you turned of your device. As a example flag value or a count value is a little thing, so we don't want to write lenghthy codes to store in databases, using few lines we can save these variables values. However if you want to store complex data/ relational data, you have to use databases or files(JSON, CSV or TXT).
You can visit this website to get details about how to use SharedPreferences in Dart.
This is the complete code for the Simple Poll App. I used this example app to explain SharedPreferences, ButtonBar Widget, BottomAppBar Widget and for other things.
https://fluttercorner.com/how-to-store-and-get-data-from-shared-preferences-in-flutter/
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