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UUID stands for Universal Unique Identifier, a standard in software construction and part of the Open Software Foundation's distributed computing environment. Its purpose is to provide unique identification for all elements in a distributed system without needing a central control for assigning identifiers. This allows individuals to create UUIDs that do not conflict with others. Consequently, database name conflicts at creation are not a concern. The most widely used UUID is Microsoft's Global Unique Identifier (GUID), with other significant applications including Linux ext2/ext3 filesystems

UUID is composed of a set of 32-digit hexadecimal numbers, so the theoretical total number of UUIDs is 16^32 or 2^128, approximately 3.4 x 10^38. This means if 1 billion UUIDs are generated per nanosecond, it would take 100 billion years to exhaust all UUIDs.

The standard format of UUID contains 32 hexadecimal digits, divided into five sections by hyphens, in the form of 8-4-4-4-12, totaling 32 characters.