Check-in, also known as registration, is the process where guests confirm their arrival at a hotel, event, or airport. During this time, individuals provide necessary information, such as identification and reservation details, to ensure a smooth experience. This step is essential for managing bookings and ensuring that all guests are accounted for. At airports, check-in involves obtaining a boarding pass and checking luggage before proceeding to security. This process can be done online or at designated kiosks and counters. Efficient check-in helps reduce wait times and enhances overall travel or event experiences for attendees.