Many features in a messaging system are related to queues.
Many messaging protocols and tools assume that publishers and consumers communicate using a queue-like storage mechanism. Queues play a major role in the messaging technology space. To define a queue in generic terms, it is a sequential data structure with two primary operations: an item can be enqueued (added) at the tail and dequeued (consumed) from the head. Messages are enqueued and dequeued (delivered to consumers) in a ( FIFO ('first in, first out') manner.
A queue in RabbitMQ is an ordered collection of messages.
