The facade design pattern creates an interface that is served as an interface to other interfaces within a system or subsystem. The benefits of using this design pattern are that subsystems are less complex, the reliance components is reduced, and communication between system components is minimized.

Consider the following illustrations. The image on the left shows the organization of a system and subsystems without a facade interface. The right-hand image shows the facade interface layered between the main classes and the subsystem:

As indicated in the diagram, the facade interface serves as an interface between the system and subsystem. It can also be correction inferred that the facade interface will prevent the unnecessary exposure of details to the system.