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Unique identifier. 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 .
Universally unique identifier. A Universally Unique Identifier ( UUID) is a 128-bit label used for information 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.
IUID - Item Unique Identification is the strategic system implemented by the DoD to enhance the traceability of the property. UID - Unique Identification, the term UID is commonly used for different things and sometimes used in place of IUID, and thus can be a source of confusion. Generally, "The UID" refers to the physical mark on the asset or ...
API key. An application programming interface ( API) key is a unique identifier used to authenticate and authorize a user, developer, or calling program to an API. [1] However, they are typically used to authenticate and authorize a project with the API rather than a human user. [1] [2]
Organizationally unique identifier. An organizationally unique identifier ( OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization. OUIs are purchased from the Institute of Electrical and Electronics Engineers (IEEE) Registration Authority by the assignee (IEEE term for the vendor, manufacturer, or other ...
MAC address. A MAC address (short for medium access control address) is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment. This use is common in most IEEE 802 networking technologies, including Ethernet, Wi-Fi, and Bluetooth.
A Uniform Resource Identifier ( URI) is a unique sequence of characters that identifies an abstract or physical resource, [1] such as resources on a webpage, mail address, phone number, [2] books, real-world objects such as people and places, concepts. [3] URIs are used to identify anything described using the Resource Description Framework ...
Digital identity requires digital identifiers—strings or tokens that are unique within a given scope (globally or locally within a specific domain, community, directory, application, etc.). Identifiers may be classified as omnidirectional or unidirectional.