Customers
A Customer is a person who can buy from your shop. A customer can have one or more
Addresses, which are used for shipping and billing.
If a customer has registered an account, they will have an associated User. The user
entity is used for authentication and authorization. Guest checkouts are also possible, in which case a customer will not have a user.
See the Auth guide for a detailed explanation of the relationship between customers and users.
Customers can be organized into CustomerGroups. These groups can be used in
logic relating to promotions, shipping rules, payment rules etc. For example, you could create a "VIP" customer group and then create
a promotion which grants members of this group free shipping. Or a "B2B" group which is used in a custom tax calculator to
apply a different tax rate to B2B customers.