Arduino is an electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs, light on a sensor, a finger on a button, or a Twitter message and turn it into an output, activating a motor, turning on an LED, publishing something online.
You can tell your board what to do by sending a set of instructions to the the board. To do so you use the Arduino Software (IDE).
Over the years Arduino has been the brain of thousands of projects, from everyday objects to complex scientific instruments.
Thanks to its simple and accessible user experience, Arduino has been used in thousands of different projects and applications. The Arduino software is easy-to-use for beginners, yet flexible enough for advanced users. It runs on Mac, Windows, and Linux.
Designers and architects build interactive prototypes, musicians and artists use it for installations and to experiment with new musical instruments. Makers, of course, use it to build many of the projects exhibited at the Maker Faire, for example. Arduino is a key tool to learn new things. Anyone, children, hobbyists, artists, programmers can start tinkering.