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Universally Unique Identifiers (UUIDs) are 128-bit numbers used to uniquely identify data. They are globally unique for practical purposes, with an almost negligible chance to being duplicate.

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Variants and Versions: A UUID has variants and versions. The 4 in this case tells you, that it is the version 4. Other versions range from 1 to 5. Those versions have variants 8, 9, A and B … , therefore the z in your UUID tells you which variant it is. The variant is used for telling which layout the UUID has. Variants are also important when it comes to backwards compatibility. Lenght of …
answered Aug 16 '16 by hamena314