GUID

From Saferpedia

GUID is the acronym of globally unique identifier. GUID is a special type of identifier used in software applications to provide a unique reference number. The value is represented as a 32 character hexadecimal string, such as {21EC2020-3AEA-1069-A2DD-08002B30309D} and usually stored as a 128 bit integer. The term GUID usually, but not always, refers to Microsoft's implementation of the Universally Unique Identifier (UUID) standard.

The primary purpose of the GUID is to have a totally unique number. Ideally, a GUID will never be generated twice by any computer or group of computers in existence. The total number of unique keys (2128 or 3.4×1038 - in relation there are about 1.33×1050 atoms on earth) is so large that the probability of the same number being generated twice is extremely small, and certain techniques have been developed to help ensure that numbers are not duplicated. Source: Wikipedia

Structure of GUID

The most common used structure of the data type is:

Bits	Bytes	Descriere
32	4	Data1
16	2	Data2
16	2	Data3
64	8	Data4

External links

Wikipedia's definition of GUID

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