  Radio frequency identification (RFID), The real-time location of objects and
ability to track motion provide a wide range of useful applications in areas
such as safety, security and supply chain. In recent years, radio frequency
identification technology has moved from obscurity into mainstream applications
that help speed the handling of manufactured goods and materials. RFID enables
identification from a distance, and unlike earlier bar-code technology, it does
so without requiring a line of sight. In this paper, the author introduces the
principles of RFID, discusses its primary technologies and applications.
