Question 1

What is a UUID?

Accepted Answer

UUID (Universally Unique Identifier) is a 128-bit identifier, typically represented as 32 hexadecimal characters (8-4-4-4-12 format), used to uniquely identify information.

Question 2

What are the differences between UUID versions?

Accepted Answer

v1 is based on time and MAC address, v3 on MD5 namespace, v4 is fully random (most common), and v5 on SHA-1 namespace.

Question 3

Can UUIDs repeat?

Accepted Answer

Theoretically, v4 UUID collision probability is extremely low (~1/2^122), and in practice they can be considered unique.

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