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A Universally Unique Identifier (UUID) is a 128-bit label used to uniquely identify objects in computer systems. The term Globally Unique Identifier (GUID) is also used, mostly in Microsoft systems. [1] [2] When generated according to the standard methods, UUIDs are, for practical purposes, unique.
A unique identifier (UID) is an identifier that is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. [1] The concept was formalized early in the development of computer science and information systems. In general, it was associated with an atomic data type.
Universal identifiers represent various schemes used to uniquely reference people, companies, and other things across domains, systems and organizations.
A properly written Version 4 UUID generator --such as, for example, the randomUUID() function supported by most web browsers --*should* be creating UUIDs of all 4 kinds (8, 9, a, or b in the high hex digit of octet 8) in approximately equal numbers. Version 4 UUIDs all have a few bits hard-wired in order to indicate that they *are* Version 4 UUIDs.
Unique ID for the Mifare series of chips (integrated circuits) used in contactless smart cards and proximity cards. Unique ID of a message in a folder on an IMAP server; User identifier (Unix), a code identifying each user on a Unix and Unix-like systems; Globally unique identifier (GUID) Universally unique identifier (UUID)
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Snowflake IDs, or snowflakes, are a form of unique identifier used in distributed computing. The format was created by Twitter (now X) and is used for the IDs of tweets. [ 1 ] It is popularly believed that every snowflake has a unique structure, so they took the name "snowflake ID".