Being able to turn things is pretty useful. Robots for example have lot of motors in them.
There are a few different types of motor. Each work in a slight different way and are suited to different tasks, the two types we'll be looking at today are:
As motors need quite a bit of power they can't be powered directly from the Adruino pins. Some extra electronics are required to avoid damaging the Arduino. These are usually based around transistors, that act as electronic switches. To save time we'll be using pre-build shields but this could be wired up directly.
There are several different types of motor and servo supported by this shield. With helpers assistance you should be able to experiment with a few of these.
There is some example code on http://www.4tronix.co.uk/arduino/Stepper-Motors.php