Your queue is the order in which you are to call your leads. Your queue consist of new, scheduled and postponed leads, except those that other agents has claimed.
Queues are constantly and dynamically calculated by the system, to ensure that you don't call leads claimed or currently being called by other agents.
You can say that each agent has her own, personal, dynamic queue.
This way multiple agents can work on the same list without the risk of clashing. No need to split the leads up into lists assigned to one agent each. Just let all your agents call the same list, we'll take care of the rest. We call it "dynamic lead distribution".