Answer:
services
Step-by-step explanation:
Services are defined as intangible and non-physical economic transactions. Generally speaking, services are provided, they are not manufactured, e.g. banking, retail, health care, education, etc.
In this case, Zappos is an online retailer whose main activity is to offer a service (retail) but it includes additional free services to gain a competitive advantage (although most online retailers offer the same free services). It offers free transportation of purchased goods, so the company delivers the products for free and in case you do not like the products, you can send them back for free and get a refund.