An electronic tag attached to an object such as a card in order to store the unique identification information of a person or object. An RFID reader wirelessly recognizes the information stored in an RFID tag using radio waves. An RFID tag generally consists of a small processor, a memory, a small antenna, a battery, and so on. RFID tags are divided into various types depending on their capability to read/write, the presence of a built-in battery, and the RF(Radio Frequency) band, etc.