order tracking number usps is a unique code provided by the United States Postal Service (USPS) to track the progress of a package. Customers can use the USPS tracking number to monitor the status of their shipment, from acceptance to delivery. The tracking number is typically provided when the package is shipped, and it can be entered on the USPS website or in their mobile app to receive real-time updates. Tracking numbers allow both senders and recipients to check the location, estimated delivery date, and any transit issues related to the package.