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A UUID (Universally Unique Identifier) is used to generate a unique identifier. Each version has a different generation method and purpose.
Completely randomly generated and widely used. The possibility of collision is extremely low.
Result: 00000000-0000-0000-0000-000000000000
Generated by combining a Unix timestamp with a random value. It is sortable by time and advantageous for database indexing.
Result: 00000000-0000-0000-0000-000000000000
Generated based on the current time and MAC address. It is unique but may expose time information.
Result: 00000000-0000-0000-0000-000000000000
Generated by converting a namespace and name string into an SHA-1 hash. It is more secure than v3.
Result:00000000-0000-0000-0000-000000000000
Generated by converting a namespace and name string into an MD5 hash. It always produces the same result for the same input.
Result:00000000-0000-0000-0000-000000000000