ups usps fedex are three of the most widely used shipping carriers for e-commerce businesses, each offering distinct services and pricing models. UPS (United Parcel Service), USPS (United States Postal Service), and FedEx all provide reliable shipping options for both domestic and international shipments. UPS and FedEx are commonly used for larger, heavier packages and expedited services, while USPS offers affordable and reliable shipping for smaller items. For businesses, selecting the right carrier depends on factors such as cost, delivery speed, and shipment size. Integrating these carriers with fulfillment platforms ensures smooth logistics and timely deliveries.