Radio frequency identification (RFID) is a wireless communication technology that identifies specific targets and reads and writes data via radio signals without identifying mechanical or optical contact between the system and a particular target.
Radio signals are transmitted by electromagnetic fields tuned to radio frequencies, which are transmitted from labels attached to objects to automatically identify and track the object. Some of the labels issued from the field in recognition of the recognizer can get energy, do not need batteries; also the label itself has the power, and can emit radio waves (electromagnetic field into radio frequency). The label contains electronic information stored within several meters can be identified. Unlike barcodes, RFID tags do not need to be in the eye of the identifier or embedded within the tracked object.
RFID technology has been used in many industries. By attaching tags to a car that is being produced, it is convenient for the factory to track the progress of the vehicle on the production line. The warehouse can track where the drugs are located. RFID tags can also be attached to livestock and pets to facilitate positive recognition of livestock and pets (positive identification means preventing the use of the same identity by several livestock). Radio frequency identification cards allow employees to access locked buildings, and radio frequency transponders on cars can also be used to collect toll roads and parking lots.
Some RFID tags are attached to clothing, personal belongings, and even into the human body. Since the technology may read personal information without permission, the technology could also be a violation of privacy concerns.
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