Key properties of a queue

Now that we know what a queue is and why it is such a useful data structure let's look at its different properties and useful components. These properties are modified when we add or remove data to or from the queue.

Capacity

A queue's capacity is the maximum number of data items it can hold. Only bounded queues have a predefined capacity. Unbounded queues ideally have an unlimited capacity restricted only by the amount of memory available on the system where the code executing the queue implementation is running.