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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
Hi there!

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.

-ASIAX   Frequent Answerer