What is RFID

Radio Frequency Identification (RFID) is a wireless communication technology, which can identify specific targets and read and write related data through radio signals, without establishing mechanical or optical contact between recognition system and specific targets.
Radio signals are transmitted from tags attached to objects by electromagnetic fields tuned to radio frequencies to automatically identify and track the objects. Some tags can get energy from the electromagnetic field emitted by the identifier when they are identified and do not need batteries. Some tags have their own power supply and can actively emit radio waves (electromagnetic fields tuned to radio frequencies). The tag contains information stored electronically and can be recognized within a few meters. Unlike bar codes, radio frequency tags do not need to be in the sight of the identifier, but can also be embedded in the tracked object.
Radio Frequency Identification (RFID) technology has been used in many industries. By attaching the label to a car in production, the factory can easily track the progress of the car on the production line. Warehouses can track where drugs are. Radio frequency tags can also be attached to livestock and pets to facilitate active identification of livestock and pets (positive identification means preventing several livestock from using the same identity). Radio Frequency Identification Card (RFID) allows employees to enter the locked building. Radio Frequency Transmitters on automobiles can also be used to collect fees for toll sections and parking lots.
Some radio frequency tags are attached to clothing, personal belongings and even implanted into the human body. Because this technology may read personal information without my permission, this technology also has the risk of violating personal privacy.