What is Amazon SNS?

Amazon Simple Notification Service (SNS) is a fully managed messaging service for both application-to-application (A2A) and application-to-person (A2P) communication. SNS provides topics for high-throughput, push-based, many-to-many messaging between distributed systems, microservices, and event-driven serverless applications. It supports SMS, email, mobile push notifications, and HTTP/S endpoints. SNS enables fan-out messaging patterns, message filtering, and message attributes. It provides durability, security, and high availability with redundant infrastructure across multiple availability zones.