What is UUID and What is it Used For?

UUID (Universally Unique Identifier) is a 128-bit standard used to create unique identification numbers in software development.

UUID Types

UUID v1: Based on time and MAC address. Unique but exposes the MAC address.

UUID v4: Completely randomly generated. The most commonly used type. Collision probability is astronomically low.

Where is it Used?

• Database primary keys
• API requests and session IDs
• Unique identification in distributed systems
• File naming

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