Doppler radar is a technology that uses radio waves to detect and measure the speed of objects, such as weather patterns or moving vehicles. It works by sending out a signal that bounces off these objects and returns to the radar system. By analyzing the change in frequency of the returned signal, the radar can determine how fast the object is moving toward or away from it. This technology is widely used in meteorology to track storms and precipitation. It helps meteorologists predict severe weather events, such as tornadoes and heavy rainfall, by providing real-time data on wind speed and direction.