SQS is a distributed queuing system, which gives access to a message queue that you can use to store messages while waiting for the end system to process it
There are two types of SQS queues
Standard and FIFO queues
Standard queues guarantees message delivery at least once. But if there is a high volume of transactions in a distributed system, messages get delivered more than one time, which might cause confusion in the system
In order to avoid this issue, you can opt for FIFO queues As the name suggests the messages will be delivered First in first out manner It delivers the message only once messages are made available only till the consumer processes it, once the consumer processes the message, it is deleted this queue mechanism eradicates the duplicate transactions