A key access card is a small, rectangular card that is used to gain access to a building, room, or area that is secured with an electronic locking system. Key access cards are commonly used in place of traditional keys, as they are more convenient and offer greater security.

Key access cards work by containing a magnetic stripe or an RFID chip that holds information about the user and their level of access. When the card is swiped or tapped on a card reader, the information on the card is transmitted to the electronic lock, which then verifies the user's access level and either grants or denies entry.

Key access cards are commonly used in commercial and institutional settings, such as office buildings, hospitals, and universities. They can be programmed to restrict access to certain areas or at certain times, and can be easily deactivated if lost or stolen.