When 500,000 people hit your site at 10:00:00 AM, your backend doesn’t scale to 500,000 concurrent sessions in milliseconds. A virtual waiting room absorbs the spike: users enter a queue, receive a position, and are admitted to the actual purchase flow in controlled batches. Without it, the site goes down for everyone. With it, users wait but the experience is orderly. The Queue Token Pattern When a user arrives during high load, issue them a signed queue token containing their position and timestamp.