Answer:
If you are talking about and I pod touch its just like the iphone , but obviously you can not phone on it. Basically you get to play touch screen games, take photos read talk to people email and play music ( Cause thats what its meant for.) - just like and miny Ipad. You so cool, computer, with facebook, youtube and google.
If you are talking about the Nano, then its a tiny little square and its touch screen to you can play little games that are not worth the fuss, and play music. It is not as good as the I pad, I phone, Or the touch. But if all you are looking for is a music player then you find low prices on ebay.
If its the shuffle that you are after, then its just like an nano but bigger, thinner than the touch but its not touch screen.