Motion detectors are devices that sense movement in a specific area. They use various technologies, such as passive infrared, ultrasonic, or microwave, to detect changes in the environment. When motion is detected, the device can trigger alarms, lights, or cameras, making them useful for security systems and automation. These detectors are commonly used in homes and businesses to enhance safety and convenience. For example, they can automatically turn on lights when someone enters a room or alert security personnel if unauthorized movement is detected. Motion detectors are an essential part of modern security and energy-saving solutions.