Question 1

What is a UUID?

Accepted Answer

A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hexadecimal digits in 5 groups separated by hyphens: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. UUID v4 uses random numbers, making collisions virtually impossible (1 in 2^122).

Question 2

What is the difference between UUID and GUID?

Accepted Answer

UUID and GUID (Globally Unique Identifier) are essentially the same thing. GUID is the term used by Microsoft, while UUID is the standard term used in RFC 4122. Both refer to a 128-bit unique identifier.

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