What Is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. Version 4 UUIDs are generated using random or pseudo-random numbers, making collisions practically impossible (1 in 2¹²² probability).
UUIDs are used extensively in databases (primary keys), distributed systems (avoiding ID conflicts), session tokens, file naming, and API request tracking. This generator uses the Web Crypto API for cryptographically secure random generation.