In one sentence
Use SQS to queue work, SNS to fan out notifications, and EventBridge to route structured events by rules.
Key points
- SQS buffers messages for consumers to pull and supports independent retries and DLQs.
- SNS pushes one published message to multiple subscribers.
- EventBridge matches event patterns and sends events to selected targets across AWS, applications, and SaaS.
Exam takeaway
A common design is EventBridge or SNS for routing, with SQS queues protecting individual consumers.