What is Amazon SNS?

Amazon SNS (Simple Notification Service) is a fully managed pub/sub messaging service that enables message delivery from publishers to subscribers. It supports multiple protocols including HTTP/HTTPS, email, SMS, mobile push notifications, and SQS queues. SNS provides message fanout to multiple subscribers simultaneously and supports message filtering based on subscription attributes. It offers high throughput, durability, and availability with message encryption at rest and in transit. SNS can be used for application-to-application (A2A) and application-to-person (A2P) messaging. It integrates with CloudWatch for monitoring and supports cross-region message delivery.