alert on usps tracking refers to notifications sent to customers when there is an update or change in the status of a package being shipped via USPS. Alerts can include information such as package arrivals at local post offices, delays, or successful delivery. USPS tracking alerts are available via email or text message, allowing customers to stay informed about their shipments. These alerts help ensure that the recipient knows when to expect delivery and can address any issues if there are delays or other problems with the shipment.