This document provides an introduction to the Internet of Things (IoT). It defines IoT as a system of devices connected to the internet that can collect and exchange data without human intervention. These connected devices, called "things", include appliances, lights, security systems and more. The document outlines the IoT lifecycle of collecting data from sensors, communicating that data, analyzing it, and taking action. It also discusses challenges of IoT like sensing environments, connectivity, power usage, security, and complexity. The conclusion is that while complex, IoT can transform businesses and lives by connecting physical things to digital applications.