An Arduino is an open-source electronics platform that allows boards to read inputs from sensors and buttons and turn them into outputs such as activating motors or turning on LEDs. The document discusses what an Arduino is, noting that it is an open-source hardware and software platform, and then explains that Arduino boards can read inputs and use those inputs to control outputs.

1. Our Arduino
Project
Marco Fdez. de Velasco

2. What is an arduino?
Arduino is an open-source electronics platform based on
easy-to-use hardware and software.

3. What is Arduino used for?
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.