radar is used in many everyday items. frying on a plane and watching the evening weather forecast all involve one thing-radar. radar is a technology that detects the presence of another object further away. the basic principle of radar is based on radio waves. radar bounces radio waves off a distant object. sound waves do not travel that far. but radio waves travel much further. a controltower at an airport used radar to see how far away planes are. this is the same concept as when a person yells in a canyon. thier voice gose across the canyon, hits the other side, and then bounces back. this is called an echo. radar is just like an echoing voice.