Radar is used in many everyday items. Flying 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 is based on radio waves. Radar bounces radio waves off a distant object. Sound waves traves much further. A control tower at an airport uses radar to see how far away planes are. This is the same concept as when a person yells in a canyon. Their voice goes across the canyon, hits the other side, and then bounces back. This is called an echo. Radar is just like an echoing voice