For a start, Amazon SQS is a pseudo-queue which means the delivery of every message(if it reaches the queue) is guaranteed but not in a FIFO fashion which usually happens in a queue. If the order of messages is important to you and you want the queue to work in a FIFO fashion, the Amazon … Read more
SNS is a distributed publish-subscribe system. Messages are pushed to subscribers as and when they are sent by publishers to SNS. SQS is distributed queuing system. Messages are not pushed to receivers. Receivers have to poll or pull messages from SQS. Messages can’t be received by multiple receivers at the same time. Any one receiver can receive a message, process and delete it. Other receivers do not receive … Read more