What does a tracking number signify?

A tracking number is specifically designed as a unique identifier that allows both the sender and the recipient to monitor the status and location of a package as it moves through the postal system. This number enables users to access real-time updates regarding when and where the item is during its journey, enhancing the transparency and reliability of the shipping process.

For example, when you ship a package, the postal service assigns a tracking number that can be entered into their website or app to check the package's progress. This system is crucial for both customer satisfaction and efficient delivery logistics, making it an essential aspect of the mailing process.

In contrast, the other options relate to different aspects of the mailing process but do not encapsulate the primary purpose of a tracking number. For instance, a unique code for the sender's information pertains to sender identification rather than package tracking. A verification code for postage payment indicates a completely different function related to financial transactions in mailing, and a return address for undeliverable mail serves as a location for returning items but does not provide tracking capabilities.