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Standard message queue is based on Cron jobs. By default Salesforce cron generate schedules Every 1 minute.
For magento Cron installation refer to “Magento 2 CRON Setup“ article
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RabbitMQ message queue is an open source message broker that offers a reliable, highly available, scalable, and portable messaging system. Message queues provide an asynchronous communications mechanism. It supplies faster data synchonization
For RabbitMQ installation refer to “RabbitMQ Overview“ Magento devdocs article
How to enable Salesforce RabbitMQ Message Queue in Magento:
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