Arduino is an open-source electronics platform based on easy-to-use hardware and software. It’s intended for anyone making interactive projects. 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 microcontroller on the board.
For example, you could use an Arduino board to build a robot that follows a line on the ground. You would attach a sensor to the board that reads the line and then program the board to move the robot when it senses the line.