This document provides an overview of the Internet of Things (IoT). It begins with motivation for the IoT, discussing how physical objects are becoming connected to the internet through embedded sensors and the convergence of the physical and digital worlds. Examples of application domains for the IoT are then described, such as smart homes, cities, transportation and health. Challenges and future directions are also discussed, such as privacy concerns and the potential for the IoT to extend to nanotechnology and more intelligent systems.