| Service | Think of it as |
|---|---|
| SQS | A durable queue between producers and consumers |
| SNS | A fan-out notification system |
| Kinesis | A high-throughput event stream |
SQS:
Is ideal when
- Producers and consumers run at different speeds
- You want retry, durability, and backpressure
- Each message should be processed at least once
SNS
SNS is about fan-out, not durability for processing.
- Push-based
- One message → many subscribers
Subscribers can be: SQS queues or HTTP endpoints or Lambda
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