This document provides an overview of RFID concepts and technology. It discusses the historic development of RFID from identification systems in World War 2 to modern applications. The current RFID technology section describes the components of RFID tags, including chips, antennas, and batteries. It also discusses the different energy sources for tags, common frequency bands used, standards, and how RFID systems work along with a backend database. Application areas mentioned include tracking people, animals, documents, supporting manufacturing and healthcare, attendance tracking, and automatic toll payments.