UUID (Universally Unique Identifier)
A 128-bit identifier designed to be unique across space and time without coordination.
A UUID is a 128-bit value, usually written as 32 hexadecimal digits in five groups (8-4-4-4-12). The most common variant — UUID v4 — is generated from random or pseudo-random numbers, giving practically zero collision probability. UUIDs are widely used as primary keys, request IDs and idempotency tokens.
Reviewed by The Markvibe Team · Last updated 2026-06-28
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Related terms
- Cryptographic Hash — A fixed-length fingerprint derived from arbitrary input via a one-way function.