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 gauge the distance to the obstacle. These sensors are typically located in the front and rear bumpers of the vehicle. They can significantly reduce the risk of collisions with other cars, pedestrians, or objects, making parking safer and easier, especially in tight spaces.