What is a UUID?

Question

Well, what is one?

Answer 1

A universally unique identifier (UUID) is a 128-bit number used to identify information in computer systems. The term globally unique identifier (GUID) is also used, typically in software created by Microsoft. When generated according to the standard methods, UUIDs are for practical purposes unique. Their uniqueness does not depend on a central registration authority or coordination between the parties generating them, unlike most other numbering schemes. While the probability that a UUID will be duplicate.

Answer 2

A UUID is a 128-bit number that is used to uniquely identify some entity. Depending on the specific mechanisms used, a UUID is guaranteed to be different or is, at least, extremely likely to be different from any other UUID generated. The UUID relies upon a combination of components to ensure uniqueness. A UUID contains a reference to the network address of the host that generated the UUID, a timestamp and a randomly generated component. Because the network address identifies a unique computer, and the timestamp is unique for each UUID generated from a particular host, those two components should sufficiently ensure uniqueness.