usps nu track is a tracking system used by USPS to track the progress of a package as it moves through the postal network. USPS offers a variety of tracking services, with USPS NuTrack being one of the systems used for specific services. By entering the tracking number provided by the sender, customers can monitor the status of their package, including updates on its location and estimated delivery time. This tracking system is useful for both domestic and international shipments, providing customers with transparency and peace of mind throughout the delivery process.