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Keycards are small, plastic cards embedded with electronic chips or magnetic stripes that are used to access secured areas or facilities. These cards are typically programmed with unique codes or access permissions that allow individuals to unlock doors, activate elevators, or gain entry to restricted areas by simply swiping or tapping the card on a card reader. Keycards are commonly used in hotels, office buildings, parking garages, and other facilities where access control is necessary for security purposes.