Message queues are a communications model between multiple parties: one-to-one, one-to-many or many-to-many.
A queue is a first-in first-out data structure.
Message brokers are servers that assure the following properties for messages: they don't get lost; they are persistent; they are delivered in order.
Message queues enable asynchronous communication, because the sender doesn't have to wait for the receiver, as they connect to each other through the message brokers.
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