RFID is commonly used in Access Control, using radio-frequency electromagnetic fields to allow the transfer data to identify people of objects without making physical contact. RFID technology makes use of electromagnetic waves to capture and read transmitted data; the information is electronically stored on a tag that is attached to an object or to the carrier, and that tag’s chip is activated to share its information when it’s near a reader. These tags can be detected from several feet away by the receiver, making them useful in access control for buildings with many cardholders. RFID technology is popularly employed in access control systems to allow only the entry of authenticated and authorized personnel to secure spaces.