A card door lock, also known as a smart card lock, is a type of electronic lock that uses a smart card instead of a traditional mechanical key to control access to a building or room. These locks are becoming increasingly popular in residential, commercial, and industrial settings due to their high level of security and convenience. How It Works: A card door lock system consists of a reader device and a smart card. The reader device is installed on the door, and the smart card is given to the person...