The document discusses the concept of the Internet of Things (IoT). IoT refers to connecting everyday appliances and devices to the internet to allow them to exchange information and be controlled remotely. For example, a home automation system could connect lights, air conditioning, and water heaters to a single network that is controllable from a mobile device. This would allow a user to turn on the air conditioning before arriving home from work using their phone. The reach of IoT is potentially everything that can be assigned an IP address, connecting all devices over the next few decades. Key technologies that power IoT include IP addresses, wireless mediums like Bluetooth and WiFi, and unique device identifiers. The document outlines several applications of IoT including