Radio Frequency Identification (RFID)

The RFID device serves the same purpose as a barcode or a magnetic strip on the back a of a credit card or ATM (it provides a unique identifier for that object). Just as a barcode or a magnetic strip must be scanned to get to the information, the RFID device must be scanned to retrieve the identifying information. It is the wireless, non-contact use of radio frequency electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to the objects. They can be attached to clothing, possessions, or even implanted within people.

 

 

With RFID, the electromagnetic or electrostatic coupling in the RF portion of the electromagnetic spectrum is used to transmit signals. The system consists of an antenna and a tranciever, which read the radio frequency and transfer the information to a processing device, and a transponder, or a tag, which is an integrated circuit containing the RF circuitry and information to be transmitted. One of the main differences between RFID and a barcode technology is RFID eliminates the need for line-of-sight reading that barcoding usually depends on. It also does not need to be positioned precisely relative to the scanner. At each successive stage of production, the RFID tag tells the computers what the next step of automated assembly is.
http://www.globalresearch.ca/the-implanted-radio-frequency-identification-chip-smart-cards-in-a-surveillance-society/10097
http://www.webopedia.com/TERM/R/RFID.html