This document provides an introduction to ambient intelligence, including its origins, features, technologies used, benefits and drawbacks. It was introduced by Philips Research in 1998 and later taken up by the European Commission. Key features include unobtrusive hardware, ubiquitous computing and communication, and human-centric interfaces. Main technologies used are RFID, sensors, software agents, nanotechnology, and affective computing. Benefits include revolutionizing human life while drawbacks include complexity and cost. It concludes that ambient intelligence has strengthened and expanded since its introduction.