Application Integration
Amazon SQS, Amazon SNS, and Amazon EventBridge
Complementary messaging services: SQS buffers messages in queues, SNS pushes messages to subscribers, and EventBridge routes events from sources to targets using event rules.
Key points
- SQS decouples producers and consumers through a durable queue that consumers poll.
- SNS uses publish/subscribe fanout to multiple endpoints or subscribers.
- EventBridge routes events based on event patterns and integrates AWS, SaaS, and custom sources.
- Step Functions orchestrates multi-step workflows rather than acting as a general message buffer.
Best-known use cases
- Buffer work until a consumer is ready with SQS.
- Fan out a notification to multiple subscribers with SNS.
- Route matching business or service events with EventBridge.
What candidates often confuse it with
- SQS is queue/buffer; SNS is push/fanout; EventBridge is event routing.
- Step Functions coordinates workflow states and steps.
Key Cloud Practitioner takeaway
Queue is SQS, fanout notification is SNS, and event-rule routing is EventBridge.
Related services
- Other in-scope service recognition
Relevant exam tasks
- D3.8