When a new customer places an order with your store, their name and information are automatically added to your customer list. A customer profile is created when a customer interacts with your business in any of the following ways:
signing up for your mailing list or a customer account
placing an order
starting an order, but abandoning their checkout
Alternatively, you can add a customer to your store manually.
You can send email messages to individual customers from your Shopify admin, or send discounts and email messages to groups of customers by using customer segments.