Amazon Simple Notification Service (Amazon SNS) is a web service that enables applications, end-users, and devices to instantly send and receive notifications from the cloud.

Developer Guide
Provides a conceptual overview of Amazon SNS and includes detailed development instructions for using the various features.
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API Reference  
Describes all the API operations for Amazon SNS in detail. Also provides sample requests, responses, and errors for the supported web services protocols.
  Quick Reference Card
Briefly covers the essential commands for using Amazon SNS from the command line.