Encapsulation is the process of hiding the complexity as well as the sources of change. If you take automobile engines, they are the great sources of turbulence, vibration and noise. So, encapsulating or enclosing them helps in reducing the vibration, noise and harshness. However, they could be used by the driver through the common interface available but at reduced noise levels. But the manufacturer as well as the service provider will know about the encapsulation but it is not needed for the user as they only will be using the interface to operate the car. The recent example is the Mercedes Benz C-class which has been encapsulated to provide the car with aerodynamic features.