its when you have an online store and you dont have the items you sell in stock but when an order is made you go to the supplier, usually online, purchase the item and send it to the person who make the order directly. your profit will be your selling price - suppliers price - shipping - tax when you bring it to our context you can list the items you want to sell in the online directories then when you receive an order you bring the item and send it to person, but the catch here is if you are going to bring it from abroad the delivery time might be long and buyers usually dont want to wait unless the item cant be found here and also the items might be subjected to import tax which will jack up the price