Group Managed Service Accounts provide a higher security option for non-interactive applications, services, processes, or tasks that run automatically but need a security credential.
These service accounts are given automatically-generated passwords. Given certain permissions, it is possible to retrieve these password hashes from Active Directory. To see what users or groups have permissions to do that for a given service account, we can look up the PrincipalsAllowedToRetrieveManagedPassword user property on the account.