Microwave sensors are devices that use microwave radiation to detect motion or measure distance. They work by emitting microwave signals and analyzing the reflected waves that bounce back from objects. This technology is commonly used in security systems, automatic doors, and various industrial applications. These sensors can operate in different frequency ranges, allowing them to be sensitive to various types of movement. Unlike passive infrared sensors, which detect heat, microwave sensors can work effectively in complete darkness and through obstacles like walls. Their versatility makes them valuable in both residential and commercial settings.