Let’s take a concrete example. At 10 am, the online ticketing service for your favourite artist’s concert opens. We observe an increase in the number of visitors on our site, in particular on the page of this artist, well before the opening of the ticket office. In order not to disrupt the entire site, visitors to the artist’s page will be placed in a virtual “waiting room”. At 10 am, visitors will leave the “waiting room” to be placed in a “queue”. The order of the visitors in this queue is determined randomly. At this point, it is impossible to know who was there first. However, if you try to order tickets at 10:02, you will be placed at the end of the queue.