How does RFID work?
Basic RFID system 
The figure above shows an overview of a RFID system. A simple RFID system consists of a RFID reader and a RFID tag. And, inside of each sophisticated tags there then consists of a radio transmitter and radio receiver. This enables a RFID reader and a RFID tag communicates each other through a specified radio frequency. There are three main roles a RFID reader plays other than signaling RFID tag to transmit desired information back to the RFID reader. Firstly, a RFID reader has the responsibility of keeping RFID tags powered up. Secondly, a RFID reader demodulates incoming signals from the RFID tag down. This process slows the incoming signals down enough so that the RFID reader is able to process the signals. Finally, after the incoming signals are slowed down, RFID then has the responsibility of decoding the incoming signals into the words people can interpret. Both a RFID reader and a RFID tag can be easily made into almost any desired shape and size. Because of the versatility, RFID system can almost fit into wherever needs a field needs to identify, track, and manage objects, maybe even people, or animals.