RabbitMQ definition

RabbitMQ is an MQ Message Queuing system that allows you to communicate to a multitude of actors in a fast, secure, asynchronous and reliable way.

RabbitMQ acts as a middleware between producers and consumers of messages.

Features

• Guarantees the delivery and order of the messages that are consumed, respecting the order of arrival and only consumed once.
• Redundancy of messages in different queues, allows high availability and fault tolerance.
• Flexible routing.
• Decoupling thanks to intermediate layers of inter-process communication.
• Scalability with more processing units, queues can balance your loads.

Source: Official website