Radio Frequency Identification

                

            Radio Frequency Identification, or RFID for short, is a wireless system made up of two parts: readers and tags. Readers are devices with antennas that emit radio waves and receive signals from the RFID tag. To communicate their information to nearby readers, tags use radio waves. Tags can be passive or active. Passive tags are not powered by batteries, but by the radio waves from the reader. Active tags have their own power source.

            RFID systems use the radio waves to transfer data about people and objects. Since the 1970s, RFID technology has been available for commercial use. According to dhs.gov, it can be found in things such as car keys, employee identification, medical history/billing, highway toll tags, and security access cards. It also has a wide variety of uses in hospital settings and libraries. There is no personal information, just a number that is stored in secure databases.

Example of RFID technology

      http://www.fda.gov/Radiation-EmittingProducts/RadiationSafety/ElectromagneticCompatibilityEMC/ucm116647.htm  http://www.dhs.gov/radio-frequency-identification-rfid-what-it