| UUID Version | Description |
|---|---|
| v1 | This version combines a timestamp with a type of device identifier. This allows for the rapid generation of many IDs, but it can sometimes reveal information about the generating system. Typical use cases: older systems, distributed applications that require sortable IDs. |
| v4 | This version is based almost entirely on random values and is currently the most widely used kind of UUIDs. It is simple, secure, and universally applicable. Typical uses: database IDs, session tokens, API objects, files—virtually everywhere. |
| v5 | A UUID with a more modern hashing algorithm. The rule here is: Same name → same UUID. Typical use case: stable, reproducible IDs for resources derived from text. |
| v6 | A further invented version of v1, but arranged so that IDs can be sorted chronologically without the privacy concerns associated with the old MAC address. Typical use cases: Databases, event streams, logs — anywhere chronological sorting is important. |
| v7 | A combination of timestamps and random elements, optimized for modern databases and high load. It offers good sortability while remaining privacy-friendly. Typical uses: modern web backends, microservices, distributed systems. |
| v8 | This version has a flexible scope: You can incorporate your own data structures as long as certain rules are followed. Typical use case: Special cases where you need UUID-like IDs with custom additional information. |
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