Why it matters

SNS enables fan-out. Understanding shapes multi-consumer event architectures.

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The architecture

Topics: named channels. Publishers send.

Subscribers: endpoints receiving from topic.

SNS pub/subTopicchannelPublisherssend eventsSubscribersSQS/Lambda/HTTP/etcSNS + SQS pattern: fan out to multiple SQS queues for independent processing
SNS architecture.
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How it works end to end

Fan-out: one publish → all subscribers.

FIFO topics: ordered + deduplicated.

Filtering: subscribers can filter by message attributes.

Retry: automatic for HTTP endpoints.