Virtual waiting rooms, also known as online queues or virtual queues, are a key tool for preventing websites and applications from crashing when they reach their maximum capacity for handling traffic. When excessive traffic is detected, users are directed to the waiting room instead of being allowed to access the site. 

The online waiting room is a static web page that displays the user's place in the queue in real-time, and provides an estimate for when the user will reach the front of the queue. When it is the user's turn to access the site, they will then be able to enter and complete their transaction.

Virtual waiting rooms help to keep websites and applications running smoothly by managing the flow of traffic and ensuring that users are able to access the site when demand is higher than the website can typically handle. By directing users to a virtual queue, websites and applications can effectively manage high levels of traffic and prevent crashing. This is especially important for businesses and organizations that rely on their website or application to function properly and serve their customers. 

Virtual waiting rooms are a simple yet effective solution for managing high levels of traffic and ensuring that websites and applications remain accessible to users. By queueing users, businesses and organizations can keep their website or application running smoothly and avoid disruptions.