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a queue is a buffer abstract data structure where various entities such as data, objects, persons, or events are stored and held to be processed later. The most well known operation of the queue is the First-In-First-Out (FIFO) queue process. A FIFO queue is analogous to a tube. In a FIFO queue, the first element in the queue will be the first one out; this is equivalent to the requirement that whenever an element is added, all elements that were added before have to be removed before the new element can be invoked. Unless otherwise specified, the remainder of the article will refer to FIFO queues.

Source: wikipedia.org

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