An online store that neither has products of its own nor botheration of shipment, just focuses on selling by using digital means.

“Supply chain” is a term that describes the path a product takes to go from conception through manufacturing and finally into the hands of a customer.  If we were talking with hard-core supplier chain gurus, they'd insist a product's supply chain reaches all the way to the mining of the materials (like oil and rubber) used to manufacture an item. But that’s a little intense.