The Arduino YUN is a powerful, feature-rich microcontroller board that is part of the Arduino family, designed to simplify and facilitate the Internet of Things. It comes with an ATmega32u4 microcontroller, a Wi-Fi module (such as an ESP8266), a Secure Digital (SD) card slot, a 5V DC power supply, 10 GPIO pins, and other features that make the board a powerful open-source platform for various types of DIY projects. The board can be programmed using the Arduino IDE, and can easily connect to a variety of Internet-connected services, like Twitter, flickr, EtherCard, and many more. The YUN can also act as a web server and can host HTML, CSS, and Javascript files, as well as a JavaScript engine, providing developers with plenty of control over the dynamics of their Internet-connected projects.