A Waitlist (WL) ticket means that you do not have a confirmed seat or berth at the time of booking because the service is currently full. In the context of Indian Railways, a waitlisted ticket only becomes "confirmed" (CNF) if other passengers cancel their reservations. Your ticket will show a number (e.g., WL12), indicating how many people must cancel before you move to the top of the list. If your ticket remains on the waitlist after the final "chart preparation" (usually 4 hours before departure), you are legally prohibited from boarding the train and will receive an automatic refund. In aviation, a "Standby" or waitlist status is often used for travelers trying to get on an earlier flight or for those using "buddy passes," where they only get a seat if the plane isn't full at the moment the doors close.