All 7 Amazon SNS (Simple Notification Service) questions
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What types of endpoints can subscribe to an SNS topic? What is the difference between SNS Standard and FIFO topics? How does message filtering work in SNS to control which subscribers receive specific messages? How does SNS support mobile push notifications to applications on iOS and Android devices? How does SNS integrate with SQS in the fan out pattern to support multiple independent consumers of the same event? What security controls are available to restrict who can publish to or subscribe from an SNS topic?
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AWS › Amazon SNS (Simple Notification Service)

What is Amazon SNS and how does the publish subscribe messaging pattern work?

Beginner

Answer

Amazon SNS is a fully managed pub or sub messaging service that lets a publisher send a single message to a topic, which then automatically delivers that message to every subscriber currently attached to that topic, such as email addresses, SMS numbers, SQS queues, or Lambda functions, allowing you to fan out a single event to many different destinations without the publisher needing to know anything about who is subscribed.
aws sns publish --topic-arn arn:aws:sns:us-east-1:123456789012:OrderAlerts --message 'New order received'
Real-world example An online retailer publishes a single message to an SNS topic whenever a high value order is placed, and that one message is automatically delivered to the sales team's email, a Slack integration through Lambda, and a logging Lambda function all at once.

Common follow-ups: What is the difference between SNS and SQS?;How many subscribers can a single SNS topic support?

Amazon SQS (Simple Queue Service);Amazon EventBridge
All 7 Amazon SNS (Simple Notification Service) questions