A keycard is a small, portable card that uses a magnetic strip or embedded chip to grant access to secure areas, such as hotel rooms or office buildings. Users simply swipe or tap the card on a reader to unlock doors, making it a convenient alternative to traditional keys. Keycards are often used in conjunction with electronic locking systems, which enhance security by allowing for easy reprogramming and tracking of access. They can also be integrated with other systems, such as hotel management software or security protocols, to streamline operations and improve safety.