WHAT IS:-(R.F.I.D)!......
WHAT IS R.F.I.D !........ Radio Frequency Identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a small radio transponder, a radio receiver and a transmitter. When triggered by an interrogating electromagnetic pulse from a nearby RFID reader, the tag sends digital data (usually an identifying inventory number) back to the reader. This number can be used to track inventory items. Passive tags are powered by interrogating radio waves from an RFID reader. Active tags are battery powered and can be read by RFID readers from up to hundreds of meters away. Unlike bar codes, labels do not have to be in the reader's field of view, so they can be incorporated into tracked objects. RFID is one method of automatic identification and data collection (AIDC). RFID tags are used in many industries. For example, RFID tags attached to cars during production can be used to track assembly line progress, RFID tagged