What is the difference between Amazon SNS and Amazon SQS?

Question

I don\'t understand when I would use SNS versus SQS, and why are they always coupled together?

Answer 1

In simple terms, SNS - sends messages to the subscriber using push mechanism and no need of pull. SQS - it is a message queue service used by distributed applications to exchange messages through a polling model, and can be used to decouple sending and receiving components.

A common pattern is to use SNS to publish messages to Amazon SQS queues to reliably send messages to one or many system components asynchronously. Reference from https://aws.amazon.com/sns/faqs/