overnight postage is a term used for express mail services that guarantee next-day delivery. Offered by carriers like USPS, FedEx, and UPS, this option is ideal for urgent shipments such as legal documents, business parcels, or last-minute gifts. The cost of overnight postage is generally higher due to the expedited service, but it comes with added benefits like real-time tracking and delivery guarantees. Businesses that rely on fast turnaround times often integrate overnight shipping into their logistics strategy. For personal or commercial use, overnight postage ensures that time-sensitive deliveries arrive quickly and reliably.