Wholesale : vente en gros
Wholesaler : grossiste
A wholesale business is a business that sells products to other businesses, and not directly to the public.
For example, a shop keeper goes to a wholesaler to buy stock for his shop.
A business that operates like a shop, but only sells to professionals is called a cash and carry. The term is not appropriate today, as cash and carry companies accept credit cards and cheques, of course. But the idea is the same, the customer has to come to the store, pay for his goods, and carry them away. Other wholesale businesses usually deliver to customer, but not cash and carries.