RFID tags are the centrepiece of any RFID system. RFID tags can be offered in different sizes, frequencies and can be affixed to a variety of surfaces, including metal. They store the item data essential to any RFID tagging system. UHF (Ultra High Frequency), HF (High Frequency), and LF (Low Frequency) RFID tags are used for access control, data centre management, file tracking, livestock tracking, and many other applications.