delivery men, delivery boys deliver packages, documents, and other items to customers. They answer customers' questions and investigate any discrepancies with the delivered items.Delivered Duty Unpaid (DDU) is an international trade term meaning the seller is responsible for ensuring goods arrive safely to a destination; the buyer is responsible for import duties. By contrast, Delivered Duty Paid (DDP) indicates that the seller must cover duties, import clearance, and any taxes.