You can now subscribe Amazon Simple Queue Service (SQS) Standard queues to Amazon Simple Notification Service (SNS) First-In-First-Out (FIFO) topics. Thus, from a single SNS FIFO topic, you can now deliver messages to SQS Standard queues, which offer best-effort ordering and at-least-once delivery, as well as to SQS FIFO queues, which support strict ordering and exactly-once delivery. This new capability further decouples message publishers from subscribers, as the SNS topic type no longer dictates the SQS queue type that subscribers ought to use.
Source:: Amazon AWS