# SNS

*  SNS follow push mechanism to deliver the notification to the client, it eliminates the need of periodically check or poll new information and update. 
* SNS can push notifications to mobile devices, email, or any http endpoint.
*  To prevent the messages from being lost all messages published to SNS are stored redundantly across multiple AZ. 
* SNS allows you to group multiple recipients using topics. A topic is an “access point” for allowing recipients to dynamically subscribe for identical copies of the same notification.

####  One topic can support deliveries to multiple endpoints

####  Benefits

1. Instantaneous, push based delivery
2. . Simple api and easy integration with applications. 
3.  flexible message delivery over multiple transport protocol. 
4.  Inexpensive, pay-as-you-go model with no up-front costs. $ 0.50 per 1 million SNS request


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