A differential sensor is a type of sensor that is used to measure the difference between two physical quantities. It is often used in automotive applications to measure the difference between the rotational speed of the wheels on a vehicle. The differential sensor is able to detect small differences in the rotational speed of the wheels, allowing the vehicle to maintain traction and stability. This type of sensor is also used in robotics and automation systems to detect differences in the speed of two motors or other components. Differential sensors are often used in combination with other sensors, such as encoders, to provide a more accurate measurement of the difference between two physical quantities. By using a differential sensor, engineers can ensure that the system is operating as intended and that the vehicle is running smoothly.