This document provides an overview of Arduino, an open-source hardware platform used for building interactive objects and prototypes. It describes Arduino as a single-board microcontroller intended to make electronics projects more accessible. Key topics covered include the Arduino programming environment, common Arduino boards and their features, examples of simple Arduino projects like blinking an LED and building a line-following robot, and comparisons to other prototyping platforms. The document encourages readers to get started with Arduino for its low cost, easy programming environment, and large community support.