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A Version 4 UUID is a universally unique identifier that is generated using random numbers. The Version 4 UUIDs produced by this site were generated using a secure random number generator. UUIDs are 128-bit numbers that are represented as a string of hexadecimal digits in the format 8-4-4-4-12, separated by hyphens (for example: 550e8400-e29b-41d4-a716-446655440000). They are commonly used in databases, software development, and distributed systems to uniquely identify entities or resources.