Wait list, in university and college admissions, is a term used in the United States and other countries to describe a situation in which a college or university has not formally accepted a particular student for admission, but at the same time may offer admission in the next few months if spaces become available.

In the context of travel, particularly with airlines and railways, "available on waitlist" means that the confirmed seats for a specific flight or class are currently sold out, but the provider is still accepting requests in case someone cancels. When you book a waitlisted spot, you are essentially standing in a digital line. Your ticket is not "valid" for travel until it is officially "confirmed" (or "cleared"). For airlines, this often happens for "award seats" booked with miles; the airline may release more seats as the departure date nears if they haven't sold them for cash. On Indian Railways, waitlisted tickets are very common and are assigned a number (e.g., GNWL 5). As people with confirmed tickets cancel, your number moves down the line. If it doesn't reach "Confirmed" status by the time the final chart is prepared, you are usually not allowed to board and will receive a refund. It is a gamble: you are securing a chance to travel, but you have no guarantee of a seat until the system clears your request, which can happen anytime from months in advance to just hours before departure.