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What is a UUID v4?

UUID (Universally Unique Identifier) v4 is a 128-bit identifier generated using cryptographically random bytes. Each UUID looks like 550e8400-e29b-41d4-a716-446655440000 and has a probability of collision so low it is effectively impossible in practice.

UUID v4 is the go-to choice for primary keys in databases, session tokens, file names, correlation IDs, and any scenario where you need unique identifiers without a central registry or coordination between services.

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