Radar, which stands for Radio Detection and Ranging, is a technology that uses radio waves to detect and locate objects. It works by sending out a pulse of radio waves and measuring the time it takes for the waves to bounce back after hitting an object, allowing for the determination of distance and speed. Originally developed for military applications, radar is now widely used in various fields, including aviation, meteorology, and automotive safety. It plays a crucial role in air traffic control, weather forecasting, and even in modern vehicles for collision avoidance systems.