Globally Unique Identifier | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-15

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Universally_unique_identifier


00:01:33 1 History
00:03:01 2 Standards
00:04:15 3 Format
00:07:25 4 Encoding
00:08:53 5 Variants
00:09:15 6 Versions
00:11:17 6.1 Nil UUID
00:14:37 6.2 Version 1 (date-time and MAC address)
00:15:36 6.3 Version 2 (date-time and MAC address, DCE security version)
00:16:03 6.4 Versions 3 and 5 (namespace name-based)
00:20:21 6.5 Version 4 (random)
00:23:06 7 Collisions
00:25:51 8 Uses
00:27:05 8.1 In COM
00:30:50 8.2 As database keys
00:31:41 9 See also
00:32:47 10 References
00:35:04 11 External links



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SUMMARY
=======
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, without depending for their uniqueness 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 duplicated is not zero, it is close enough to zero to be negligible.
Thus, anyone can create a UUID and use it to identify something with near certainty that the identifier does not duplicate one that has already been, or will be, created to identify something else. Information labeled with UUIDs by independent parties can therefore be later combined into a single database or transmitted on the same channel, with a negligible probability of duplication.
Adoption of UUIDs and GUIDs is widespread, with many computing platforms providing support for generating them and for parsing their textual representation.