This document provides an overview of the Internet of Things (IoT). It discusses the history and evolution of IoT, including how the concept was first coined in 1999. It describes IoT as a wireless network that connects physical objects through embedded technology to collect and share data. The document outlines key characteristics of IoT systems, such as their pervasive and ubiquitous nature, heterogeneity, and vastly greater scale than the traditional Internet. An architecture for IoT is presented involving tagging, sensing, and networking physical objects.