What Is a UUID?
An ID that's unique worldwide
A UUID is a long number that almost never collides, even when many devices create their own.
What you'll learn from this poster
- What a UUID isA 128-bit ID / Shaped 8-4-4-4-12 / e.g. 550e8400-e29b-...
- Why no collisionsEnormous number of patterns / Made with randomness (v4) / Unlikely to clash without coordination
- Where it's usedA marker for data / File names / IDs made in separate places
- Key pointsUse secure randomness / v4 has no ordering / Use v7 if you want time order
A UUID is a near-unique number worldwide
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