Managing customers and communicating with them is crucial for running business. Every time a new customer places an order in your store, they appear on your customer list.
You can see and manage all your customers in your store Control Panel → My Sales → Customers:
For all of your customers create who place an order, Online store creates an account with your store. It allows your customers to use the address book, to view their order history and see the statuses of their current orders.