Hello,
VM is uses joomla user component and extends it with additional information in shopper.
If you have a joomla user (e.g user1) and go to VM --> Order & Shoppers --> Shoppers you can see all joomla registered users. Also you can see the VM group and shopper group that user belongs to.
If you expand a shopper (user) you are able to see additional information regarding the user (address, state, country, etc) and the user's order list.
Hope it help.
Regards.