Radio frequency identification

                                                     

Radio frequency identification (RFID) means wireless  use  of radio frequency electromagnetic fields to transfer the data and to track the objects, RFID use tags attached to mobile objects , which contain electronically stored information , some tags are power bye and work at short range via electromagnetic induction ,  other use local power source such is battery , else have no battery but collect energy from  EM field , which emit microwaves at high frequency , this type of tags operate at hundred meters
   
 

             
RFID  tags are used in many manufacturers products and in many industries , e.g. jeans ,shampoo, which embed tiny tracking chips in merchandise , the chips can follow goods from the time they leave the plant until you buy them at your local shopping mall a, even after u take them home
RIFD chips offer a wealth of advantages to product maker and retailers ,they can tell shippers when trucks are delayed, and they can alert store security when products are being stolen ,
RIFD is use in national identity cards, visa card, ATM cards, SIM cards, jeans , shoes etc  and one can also fit it in human body in order to track some one.