The document discusses the Internet of Things (IoT) and its key components. It defines IoT as the network of physical objects embedded with sensors, software and technologies to connect and exchange data over the internet. It provides examples of IoT devices like smart speakers and smart watches. It describes how sensors are used in IoT to collect data from devices. It discusses the role of sensors in two IoT scenarios involving a smart alarm clock and connected car. It outlines characteristics, applications, benefits and challenges of IoT. It defines what a sensor is and the types of sensors used in IoT like temperature, motion and humidity sensors. It describes features of IoT sensors like their ability to measure physical quantities and process/communicate data