Isolated Storage is a data storage that provides isolation between extensions, so that you can keep keys/values in one extension from being accessed from other extensions.
Source : BEYONDIT GmbH
In this video, I show how to use the Isolated Storage feature in Microsoft Dynamics 365 Business Central to store a password:
Source : Hougaard.com
A question I get quite often during my AL development workshops or coaching sessions for partners is this: can other apps access data that is stored in my app?
And the short answer is: yes, they can. There is no way to avoid that.
Bron : Kauffmann @ Dynamics 365 Business Central