Pub-Sub
Domain: Computer Systems
🎯 Motivation
Publish-Subscribe: publishers send messages, subscribers receive them. Decoupled communication.
📋 Concrete Example
Pub-Sub: User Service publishes user_created event. Email Service subscribes: sends welcome email. Analytics Service subscribes: tracks signup. Multiple subscribers, one publisher, no direct coupling.
🔗 Analogy
Pub-Sub is like a newspaper - the publisher (publisher) prints and distributes. Subscribers (subscribers) receive it. The publisher does not know who reads it. Multiple subscribers benefit from one publication.