Drop-shipping is an order fulfillment method that does not require a business to keep products in stock.
Instead, the store sells the product and passes on the sales order to a third-party supplier, who then ships the order to the customer. The third-party is virtually invisible to the customer.
In this model, typically only when purchased would the retailer then buy the product from the drop-ship product manufacturer or wholesaler, who in turn, ships it to the customer.
Drop-ship retailers must manage sellers' products and prices one by one, and they absorb all marketing and category risk as they grow.