The Customers menu provides access to customer account management tools, and gives you the ability to see who is currently online in your store.
To display the Customers menu:
On the Admin sidebar, click Customers .
Lists all customers who have registered for an account with your store or were added by the administrator.
Lists all customers and visitors who are currently online in your store.
The customer group determines which discounts are available to shoppers and the tax class for the purchase.