A ticket is a voucher to indicate that one has paid for admission to an event or establishment such as a theatre, movie theater, amusement park, zoo, museum, concert, or other attraction, or permission to travel on a vehicle such as an airliner, train, bus, or boat, typically because one has paid the fare. Also a ticket may be free, and serve as a proof of reservation.
A ticket may be bought at a ticket window or counter, called box offices in the entertainment industry (this term is also used for the total receipts). The ticket check may also be there, or it may be separate.
A ticket may be valid for any seat ("free seating") or for a specific one ("allocated seating"). Sometimes, e.g. for some train journeys, both are available, with an increased charge for a reserved seat. Free seating in a train means the risk that one has to stand, but in e.g. a cinema it means a seat is guaranteed, just not a specific one.
Paper or card is generally used, although plastic may be used instead for durability. Some have a barcode or magnetic stripe for keeping simple data stored on them, higher end ones use chips to store more data and prevent counterfeiting.
A paper ticket has often a perforation to separate it into two parts, one (the ticket stub) to be kept by the customer, and one to be kept by the ticket controller. Whether or not one can leave and reenter with the customer part only varies. It may not be allowed to avoid subsequent use of one ticket by multiple people, or even simultaneous use by giving the ticket to someone before the ticket check (if this is physically possible), but it may also be allowed, e.g. in a movie theater to buy, during a movie, a snack or drink before the ticket check and reenter.
Tickets may be printed in advance, or fully or partly printed when issued, or it may be a printed form that is completed in handwriting (e.g. by a train conductor who does not carry a ticket machine, but just a supply of forms and a pen).
The fraudulent practice of passing-back a ticket can be overcome by making the ticket in the form of a tamper-proof wristband.
When paying online for admission one may get a code, or a ticket that can be printed out. At the premises it is made sure that the same right of admission is not used twice.
Internet ticket fraud has become widespread, with authentic-looking but fake ticket websites taking customers' money but not delivering the tickets, notably for the Beijing Olympic Games (through websites not based in China).
Another form of virtual queuing is where the ticket carries a time-slot on it, rather than just a sequentially incremented number. This type of ticket would allow someone to do other things and then return for a roller-coaster ride, say, without having to actually stand and wait.
A paper ticket is only good for the coach operator for which it was purchased. Usually the paper ticket is for a specific journey. It is sometimes possible to purchase an 'open' ticket which allows travel on any coach between the destinations listed on the ticket. The cost for doing this is greater than a ticket for a specific journey.
Some tickets are refundable. However the lower cost tickets are usually not refundable and may carry many additional restrictions. It is now common for a traveller to print out tickets online and use these on coaches instead of having tickets sent to them in the traditional way. Many coach operators use this system to save costs; some allow a text from the operator to act as a ticket with a unique reference number. Bus tickets are similar.
Alternatively, there is the discount pass, for services such as those above: for a fee per unit time (or as a benefit on other grounds) one gets a discount on each purchase. Alternatively, a multi-use ticket (either valid a limited time, or indefinitely) may provide a discount. For example, a pass for entering a cinema 6 times within a year may cost the price of 4 or 5 tickets. A multi-use ticket may or may not be personal. If not, there may be a limitation to the number of people who can use the same multi-use ticket at the same time.