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What is a GUID (also called UUID)?

A universally unique identifier is a 128-bit label used for information in computer systems. The term globally unique identifier (GUID) is also used. When generated, according to the standard methods, UUIDs are, for practical purposes, unique.

History of the GUID

In the 1980s, Apollo Computer originally used UUID’s in the Network Computing System (NCS) and later in the Open Software Foundation‘s (OSF) Distributed Computing Environment (DCE). The initial design of DCE UUID’s was based on the NCS UUIDs, whose design was in turn inspired by the (64-bit) unique identifiers defined and used pervasively in Domain/OS, an operating system designed by Apollo Computer. Later, the Microsoft Windows platforms adopted the DCE design as “globally unique identifiers” (GUID). RFC 4122 registered a URN namespace for UUIDs and recapitulated the earlier specifications, with the same technical content. When in July 2005 RFC 4122 was published as a proposed IETF standard, the ITU had also standardised UUID’s, based on the previous standards and early versions of RFC 412. – Wikipedia

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