Keycard systems are electronic access control solutions that use a small card, often called a keycard, to unlock doors or gain entry to secure areas. These cards are embedded with a magnetic strip or a chip that communicates with a reader when swiped or tapped. Commonly found in hotels, offices, and secure facilities, keycard systems enhance security by allowing only authorized individuals to enter specific locations. In addition to improving security, keycard systems offer convenience and flexibility. They can be easily reprogrammed to grant or revoke access, making it simple to manage who can enter certain areas. Many systems also track entry and exit times, providing valuable data for security management and building operations.