Basic Information
| Field | Details |
|---|---|
| English name | Amazon SNS |
| Full name | Amazon Simple Notification Service |
| Chinese description | 通知与发布订阅服务 |
| Japanese description | 通知・パブリッシュ／サブスクライブサービス |
| Exam frequency | ⭐⭐⭐⭐⭐ |
| Often confused with | SQS / EventBridge |
In one sentence
A managed publish/subscribe service that fans one message out to multiple subscribers.
Key points
- Publishers send to a topic, and SNS pushes messages to subscribers such as SQS, Lambda, HTTP/S, email, or SMS.
- Fan-out commonly uses one SNS topic with multiple SQS queues so each consumer gets its own copy.
- SNS is push-based and does not replace a queue when buffering or independent retries are needed.
Exam takeaway
Subscription filters can route only matching messages to each subscriber.