All of the devices you mentioned -- Android device, PS3, and router -- are all computers. They are general purpose machines that are programmed for a certain se

All of the devices you mentioned -- Android device, PS3, and router -- are all computers. They are general purpose machines that are programmed for a certain set of tasks. The kinds of devices you mention can all be reprogrammed and are actively reprogrammed by people, sometimes for a similar purpose that they already performed and sometimes for completely different purposes. Just because I buy a device from Manufacturer X does not mean that said device is and only can be what the manufacturer intended. When I own a device, I have the freedom to tinker with that device, including making that device do something it was never intended to do. That is what I as a hacker love about computing machines: they are what I make them when I reprogram them.