What is RFID?

I have given many talks on the nature and usefulness of Radio Frequency Identification.  (RFID)  I see today there is an article on RFID Journal about its nature that is worth reading. We will continue to see more application, for example the recent rollout of Google Wallet, which uses a form called NFC, plus many other applications that address the transparency of the supply chain  and convenience for the consumer.  The privacy issues can and will be controlled.