This document provides an overview of radio frequency identification (RFID) technology, including its history, components, frequency ranges used, standards and adoption challenges. Key points include: 1) RFID uses radio waves to automatically identify objects using tags attached to or embedded in them. Major retailers like Walmart now require RFID tagging of pallets and cases. 2) An RFID system consists of a microchip tag and antenna that can be read by a scanner. Tags can be passive (drawing power from the reader) or active (with an internal power source). 3) Different frequency ranges including low, high and ultra-high are used depending on read range and material penetration needs. Standardization has helped