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Amazon Simple Notification Service (SNS) is a provision in the AWS service suite for enabling messaging in decoupled microservices, serverless computing setups, and other distributed systems. The system has “publishers” and “subscribers” which allows senders to “fan out” messaging to an audience (user base) through these end-to-end systems.
In a way, Amazon SNS functions as a “standalone” messaging service for these types of systems which may not have their own resident messaging functionality. Push notifications, for instance, can be embedded into serverless applications or distributed systems through SNS messaging. AWS SNS promises “many to many” broadcasting on a unique cloud model. Supported protocols include Amazon SQS, HTTP/S, email, SMS, and AWS Lambda, Amazon’s serverless solution.