This document provides an overview of the Internet of Things (IoT). It defines IoT as the network of physical devices embedded with sensors, software and other technologies that connect and exchange data with other devices and systems over the Internet. The document then discusses the history of IoT, its key characteristics, examples of applications like smart homes and cities, and the advantages it provides through automation, monitoring and savings. Finally, the document outlines some challenges of IoT such as compatibility, complexity, privacy and security issues, and the need for common standards.