Amazon SNS
Amazon Simple Notification Service (SNS) is a fully managed messaging service from AWS that enables applications, services, and devices to send and receive notifications. It supports multiple protocols like HTTP/S, email, SMS, and mobile push notifications, allowing decoupled communication between distributed systems. SNS acts as a pub/sub (publish-subscribe) system where publishers send messages to topics, and subscribers receive them through various endpoints.
Developers should use Amazon SNS when building scalable, event-driven architectures that require real-time notifications, such as sending alerts, processing workflows, or integrating microservices. It is ideal for use cases like mobile app push notifications, system monitoring alerts, and decoupling components in serverless applications, as it reduces complexity and ensures reliable message delivery across AWS services.