RFID

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A Radio Frequency Identification tag

RFID, or “radio-frequency identification,” refers to a technology wherein digital data encoded in tags or smart labels are captured by a reader via radio waves. Two types of tags exist: active and passive. Passive tags collect rf-energy from a nearby RFID reader's interrogating radio waves. Active tags have a local power source such as a battery and may operate hundreds of meters from the reader.

References

Wikipedia-favicon.png RFID on Wikipedia