RFID is "radio frequency identification."
http://www.rfidjournal.com/article/articleview/208 has a glossary of terms commonly used when discussing RFID.
"RFID tag: A microchip attached to an antenna that is packaged in a way that it can be applied to an object. The tag picks up signals from and sends signals to a reader. The tag contains a unique serial number, but may have other information, such as a customers' account number. Tags come in many forms, such smart labels that can have a barcode printed on it, or the tag can simply be mounted inside a carton or embedded in plastic. RFID tags can be active, passive or semi-passive."
There are concerns about how this technology can be used to track people's movements and otherwise invade privacy.
Radio frequency identification tags could simplify inventory, but they worry privacy advocates.
Weblog entry argues that the more people grapple with RFID to learn how it operates and how it can be manipulated, worries about its misuse should decrease.
Article in which Tesco gets accused of tagging packs of razor blades to track buyers.
Article in this online open encyclopedia..
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