Pub/Sub vs Queue

Summary

Pub/sub broadcasts a message to all current subscribers and loses it if no one's listening; a queue holds a message until exactly one consumer processes it — different guarantees for different needs.

• 1Identify which pattern fits a real scenario: broadcasting a live update vs processing a background job.
• 2Learn that a 'topic' in Kafka behaves more like a durable, replayable pub/sub than a simple queue.
• 3Understand why queues suit 'do this work exactly once' and pub/sub suits 'notify everyone currently listening'.