RFID stands for Radio Frequency Identification. RFID is the technology for automatic identification. In this technology method data should be remotely retriveted through remote devices called RFID tags. RFID tags also known as transponders, these transponders are like chips which are attached or inserted in some product, person or animal. Through radio waves these chips ot tags easily identified. Transponders are generally made of siliocon chips attached with an antennas.

typical RFID technology system embedded with a inexpensive tag which consist of transponder having digital memory chip. This tag have a unique product code. The RFID transceiver consist of an antenna, an interrogator and a decoder. The transceiver emits a signal or radio waves which activate RFID tag and information should be read or write in memory chip. When a RFID tag passes through a electromagnetic fiels of its transceiver, it detects the reader's activation signal. After reaging data the decoder decodes data and passed to the host computer. The host computer process the data using Physical Markup Language (PML).