Alternatively referred to as a GUID (globally unique identifier), UUID is short for universal unique identifier and is a 128-bit unique identification value. UUIDs are used in the Apollo Network Computing System, OSF (Open Software Foundation), DCE (Distributed Computing Environment), and Microsoft Windows, and is fully defined in RFC 4122. Below is an example of a UUID.
In the above example, the UUID has a timestamp of Monday, July 25, 2005 3:59:05 A.M. MDT. An online UUID generator can also be found at https://www.famkruithof.net/uuid/uuidgen.