# Using the message group ID with Amazon SQS FIFO Queues
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In FIFO (First-In-First-Out) queues, [https://docs.amazonaws.cn/AWSSimpleQueueService/latest/APIReference/API_SendMessage.html](https://docs.amazonaws.cn/AWSSimpleQueueService/latest/APIReference/API_SendMessage.html) is an attribute that organizes messages into distinct groups. Messages within the same message group are always processed one at a time, in strict order, ensuring that no two messages from the same group are processed simultaneously. In standard queues, using `MessageGroupId` enables [fair queues](sqs-fair-queues.md). If strict ordering is required, use a FIFO queue. 

**Topics**
+ [Interleaving multiple ordered message groups in Amazon SQS](interleaving-multiple-ordered-message-groups.md)
+ [Preventing duplicate processing in a multiple-producer/consumer system in Amazon SQS](avoding-processing-duplicates-in-multiple-producer-consumer-system.md)
+ [Avoid large message backlogs with the same message group ID in Amazon SQS](avoid-backlog-with-the-same-message-group-id.md)
+ [Avoid reusing the same message group ID with virtual queues in Amazon SQS](avoiding-reusing-message-group-id-with-virtual-queues.md)