Costco Wholesale is principally engaged in the operation of membership warehouses. Co. operates membership warehouses and e-commerce websites based on the concept that providing its members low prices on a selection of branded and private-label products in a range of categories. Co. provides merchandise and services, which include food and sundries, non-foods, fresh foods, warehouse ancillary, and other business. Co.'s other businesses sell products and services that complement its warehouse operations (main and warehouse ancillary businesses). Co. provides other services online in certain countries such as business delivery, travel, same-day grocery, and various other services.