Card readers are electronic devices used to grant access to secure areas. They work by reading a code, such as a barcode or magnetic strip, stored on a card or other form of identification. When a person holds their card up to the reader, the code is scanned and access to the secure area is validated.

Card readers are often used for access control in offices, parking garages, buildings, and other locations with limited access. They can also be used to keep track of who has had access to a secure area, which can help to increase security and identify any issues.

There are different types of card readers available on the market, depending on the type of card being used and the needs of the user. Some card readers are equipped with additional security features, such as fingerprint recognition or facial recognition, while others only work with specific types of cards. It is important to choose the right card reader for your access control system to ensure it is effective and secure.