A delivery is used to track who a package was sent to, the ZIP file and its contents, when the delivery was sent, and when the delivery was received. Deliveries can be created at any point after the package is created. Once a package is locked, a ZIP file can be created for a specific delivery. You can send a delivery by sending email, sharing to a project, or using a method outside of Windchill. Once the files are received by the recipient, the delivery can be updated to indicate that it has been received as well as if it is either accepted or rejected.