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Generate cryptographically unique identifiers — UUID v4 (random) or v7 (time-ordered)
b58ed35d-3b45-40da-870a-46ee1f37b391122 bits of pure randomness. The most widely used version. Probability of collision is astronomically low — you'd need to generate 2.71 × 10¹⁸ UUIDs for a 50% chance of one duplicate.
Embeds a Unix timestamp in milliseconds for natural chronological sorting. Ideal for database primary keys — better index performance than v4 because new records append to the B-tree instead of scattering randomly.