All the explanations so far are accurate and to the point – but might be missing something: one of the main benefits of message queueing: resilience. Imagine this: you need to communicate with two or three other systems. A common approach these days will be web services which is fine if you need an answers … Read more
RabbitMQ is an AMQP broker, while ActiveMQ is a JMS one. I suggest you read the AMQP wikipedia article to get an idea of the concepts used in AMQP, which are different than the ones you’re familiar in JMS. One of the main difference is that in AMQP a producer sends to an exchange without … Read more
It is used to reliably communicate between two distributed processes. Yes, you could store messages in a Database to communicate between two processes, but, as soon as the message is received you’d have to DELETE the message, That means a row INSERT and DELETE for each message. When you try to scale that up communicating … Read more