This document discusses using Node-RED as a prototyping tool for Internet of Things (IoT) projects. Node-RED is a programming tool that allows users to visually wire together hardware devices, APIs, and online services using a browser-based flow editor. The document provides instructions on installing Node-RED on a Raspberry Pi, introduces MQTT as a common IoT protocol, and shares additional resources for learning more about Node-RED, MQTT, and building IoT workflows and demos.