A "Lost Package" refers to a situation where a shipment, typically sent through a delivery service, cannot be located or delivered to its intended recipient. This can occur due to various reasons, such as incorrect addressing, mishandling during transit, or theft. When a package is reported as lost, the sender or recipient can file a claim with the delivery service, like UPS or FedEx. The company will then investigate the issue, which may involve tracking the package's last known location and determining if it can be recovered or if compensation is warranted.