What is a UUID?
UUID stands for Universally Unique Identifier.
According to Wikipedia, a UUID is a 16-byte (128-bit) number. In its canonical form, a UUID is represented by 32 hexadecimal digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (32 digits and four hyphens).
How Unique is a UUID?
Pretty darn unique!
There are 340,282,366,920,938,463,463,374,607,431,768,211,456 possible UUIDs (16 to the 32nd power), or about 3 × 1038.
What are UUIDs used for?
If you're at this page, you probably already know, but - in case you were searching for UUID (Ultimate Urinal Interior Decorators), and found this instead, this is for you.
UUIDs are idenfication numbers used in the computer / programming industry often as the primiary key of a database table. Confused? How about in simpler terms: It's a VERY unique number that computer geeks (and proud of it!) use to make sure their geeky data doesn't get mixed up with other geeky data.
What's the difference between a UUID and a GUID?
A GUID (Globally unique identifier) is usually synonymous with UUID, but can also refer to Microsoft's version of a UUID.