UAV's, as the name suggests, are flying vehicles without an onboard human personnel, they are either remote controlled or onboard computer guided. These are one of the most advanced weapons being used during many modern wars and peacekeeping missions. They belong to the category of unconventional warfare. By effectively employing them one may achieve strategic victory without putting human lives to risk, so they may be regarded as peaceful weapons. It is one of the areas of active research in our country which include both the equipment development as well as the software development. In the equipment development they are usually made from Aramid and Carbon fiber based epoxy matrix composites and in software development they employ high end Artificial Intelligence, Neural Networks, Image Processing, etc. So both fields require highly qualified experts. In this small session we will attempt to shed some light on the basic aspects of this smart weapon and will try to study some of the models currently developed and used in the defense industry internationally.