Airport check-in is the process where passengers confirm their presence on a flight and receive their boarding passes. This can be done at a check-in counter, through a kiosk, or online before arriving at the airport. During check-in, travelers may also check in their luggage, which is then tagged and sent to the aircraft. After check-in, passengers proceed to the security screening area, where they must show their boarding passes and identification. Once cleared, they can access the departure lounge and wait for their flight to be called for boarding.