Amazon Simple Notification Service (SNS) is a fully managed messaging service for application-to-application (A2A) and application-to-person (A2P) communication. It enables you to decouple microservices, distributed systems, and serverless applications. SNS is commonly used for sending notifications to users via SMS, push notifications, email, or other messaging services, as well as for event-driven architectures where one service needs to notify other services of state changes.
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