Knowra Radio-frequency identification Radio-frequency identification Radio-frequency identification (RFID) uses radio waves to identify objects through data stored in electronic tags and read by specialized devices. Tags can be passive, battery-powered, or actively transmitting.
RFID tag : An electronic device that stores identifying data and communicates it by radio with an RFID reader. The tag carries the data that makes an object distinguishable.
Radio wave : An electromagnetic wave with a frequency used for wireless communication and sensing. RFID communicates by transmitting and receiving radio waves.
Electronic toll collection : Automated payment of road tolls using electronic identification and transaction systems. Vehicle tags let toll systems identify accounts without stopping traffic.
Barcode : A machine-readable representation of data encoded in patterns of lines, spaces, or shapes. Unlike most RFID, barcodes require optical scanning and usually a visible line of sight.
Consumer privacy : The ability of people to control the collection, use, and disclosure of information about them. Persistent tags can expose product or person-linked identifiers beyond the original transaction.
RFID reader : A device that sends radio signals to RFID tags and receives their replies. The reader energizes or interrogates tags and captures their responses.
Antenna : A conductor or structure that transmits or receives electromagnetic waves. Both readers and tags use antennas to couple information to radio signals.
Contactless smart card : A card with an embedded chip that communicates wirelessly with a nearby reader. Transit and access cards commonly use RFID-derived contactless communication.
Bluetooth Low Energy : A low-power wireless communication protocol designed for short-range devices and periodic data exchange. BLE tags can broadcast independently, while passive RFID tags generally depend on reader energy.
RFID security : The protection of RFID tags, readers, and data exchanges against unauthorized access or manipulation. Weak authentication or unprotected communication can enable cloning, tracking, or data theft.
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