UUID (Universal Unique Identifier)

Definition

A 128-bit label used for information in computer systems. The probability of duplicates is virtually zero.

Format

32 hexadecimal digits displayed in 5 groups: 8-4-4-4-12. Example: 123e4567-e89b-12d3-a456-426614174000

v4 vs v1

v4: Randomly generated (most common).
v1: Time and MAC address based.

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