Keycard access is a security system that uses a special card, known as a keycard, to unlock doors or gain entry to restricted areas. Instead of traditional keys, these cards contain a magnetic strip or a chip that communicates with a card reader. When the card is swiped or tapped, the reader verifies the user's access rights and either grants or denies entry. This system is commonly used in places like hotels, offices, and secure facilities. It offers convenience and enhanced security, as keycards can be easily deactivated if lost or stolen, preventing unauthorized access and keeping sensitive areas safe.