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SQS – Simple Queuing Service SWF – Simple Workflow Service SNS – Simple Notification Service Amazon SNS is a managed notification service It works on a push mechanism, the publisher raises a request to send a message to the subscribers Use Cases Installed applications on a smartphone, often send a notification for offers and other notifications SNS stands for simple notification while SQS stands for simple queue service SNS uses a publishersubscriber system; By coupling SNS with SQS, you can receive messages at your pace It allows clients to be offline, tolerant to network and host failures You also achieve guaranteed delivery If you configure SNS to send messages to an HTTP end point or email or SMS, several failures to send message may result in messages being dropped Learningtofly How To Setup An Aws Sns Topic And Subscription Amazon sns sqs tutorial