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RFID stands for radio-frequency identification.
An easy explanation for this is like a tracker: it uses radio frequency in the air to identify or track down tags that can trigger the tracking device. 
ASIAX
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RFID means Radio Frequency Identification

They use electromagnetic fields to track and ID things that have an RFID chipset. This can be used for credit cards, locks, and other things.

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ASIAX   Frequent Answerer
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