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.
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  Quick Reference Card
Briefly covers the essential commands for using Amazon SNS from the command line.
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