A queue is used to prioritize, distribute and assign records to a collection of users. Prioritize, distribute, and assign records to teams who share workloads. Access queues from list views. Queue members can jump in to take ownership of any record in a queue. They’re available for cases, contact requests, leads, orders, custom objects, service contracts, and knowledge article versions.
Set Up Queues - https://help.salesforce.com/articleView?id=setting_up_queues.htm&type=5