Parking sensors are devices installed in vehicles to assist drivers while parking. They use ultrasonic or electromagnetic technology to detect obstacles around the car. When the vehicle approaches an object, the sensors emit a series of beeps that increase in frequency as the car gets closer, helping the driver avoid collisions. These sensors are typically located in the front and rear bumpers of the vehicle. They can be particularly useful in tight parking spaces or when reversing. Many modern cars come with parking sensors as a standard feature, enhancing safety and convenience for drivers.