A queue is often compared to a line. A queue can be associated with any item, person or service that spends any amount of time in a line before work begins.
During the holiday season customers are asked to take a number and wait to purchase their chocolates. After the customer has taken their number they then stand in line until it is their turn. This is one example of people standing in queue.
Queue time can generally take up more than 75% of the total lead time in many different factories. Finding and reducing these queue points can significantly improve throughput.