Radio Frequency Identification (RFID) is a wireless communication technology that uses radio signals to identify specific targets and read and write related data without the need to identify mechanical or optical contact between the system and a particular target.
The radio's signal is transmitted from the tag attached to the item by an electromagnetic field that is modulated into a radio frequency to automatically identify and track the item. Some tags receive energy from the electromagnetic field emitted by the recognizer when they are recognized, and do not require a battery. The tag itself has a power source and can actively emit radio waves (electromagnetic fields modulated to radio frequencies). The tag contains electronically stored information that can be identified within a few meters. Unlike barcodes, RF tags do not need to be within the line of sight of the recognizer, but can also be embedded within the object being tracked.
Radio frequency identification technology is used in many industries. Attaching the label to a car that is in production, the factory can easily track the progress of the car on the production line. The warehouse can track where the medicine is located. Radio frequency tags can also be attached to livestock and pets to facilitate positive identification of livestock and pets (positive identification means preventing several animals from using the same identity). The RFID-enabled identification card allows employees to enter the locked building section, and the RF transponder on the car can also be used to collect the toll road and parking lot.
Some RF tags are attached to clothing, personal belongings, and even implanted in the human body. Since this technology may read personal information without my permission, this technology may also infringe on personal privacy concerns.