usps look up tracking is a feature provided by the United States Postal Service that allows customers to track their packages and mail. By entering the tracking number on the USPS website or in their mobile app, users can view the status and location of their shipments in real-time. USPS tracking will provide updates on where the package is in the delivery process, including its arrival at various distribution centers and its estimated delivery date. If there are any issues, such as delays or exceptions, customers will also be notified.