What is departure scan enroute to usps?

Departure scan enroute to USPS refers to the last scan of a package or mail item that is leaving the sender's local post office or processing facility and being transported to the destination post office. This scan indicates that the package has been accepted by the postal carrier and is in transit to the destination address. The departure scan enroute to USPS is an important milestone in tracking the progress of a package during its delivery process, as it signals that the package is on its way to the recipient and can be expected to arrive within the estimated delivery time frame. The departure scan enroute to USPS may also provide information such as the date and time of departure, shipping destination, and the type of shipping service used.