When building modern applications, one problem shows up everywhere: How do I uniquely identify data across systems? That’s where UUIDs (Universally Unique Identifiers) come in. What is a UUID? A UUID is a 128-bit unique identifier used to identify information in distributed systems. Example: 550e8400-e29b-41d4-a716-446655440000 It looks random - and that’s the point. Why UUIDs are Important Traditional IDs (like auto-increment integers) have limitations: Predictable Not secure Hard to scale across systems UUIDs solve all of these: Globally unique No collision (practically) Perfect for distributed systems Better for security Common Use Cases You’ll see UUIDs used in: Databases (primary keys) APIs (request IDs) Authentication tokens Microservices architecture File identifiers Types of UUIDs (Quick Overview) UUID v1 → Based on timestamp + MAC address UUID v4 → Random (most commonly used) UUID v7 → Time-ordered (modern & scalable) > Most developers use UUID v4 for simplicity.…