A boarding pass is a document that passengers receive before getting on an airplane. It contains important information such as the passenger's name, flight number, departure time, and gate number. The boarding pass serves as proof that you have checked in for your flight and are allowed to board the aircraft. When you arrive at the airport, you can get your boarding pass either at a self-service kiosk or from a ticket agent. After checking in, you will need to present your boarding pass at security and again at the gate before boarding the plane.