Introducing the Facade Pattern
According to Gang of Four, the intent of the Facade pattern is to:
“Provide a unified interface to a set of interfaces in a subsystem. Facade defines a higher-level interface that makes the subsystem easier to use.”[1]
[1] Gamma, E., Helm, R., Johnson, R., Vlissides, J., Design Patterns: Elements of Reusable Object-Oriented Software, Reading, Mass.: Addison-Wesley, 1995, p. 185.
Basically, this is saying that we need a new way to interact with a system that is easier than the current way, or we need to use the system in a particular way (such as using a 3-D drawing program in a 2-D way). We can build such a method of interaction because we only need to use a subset of the system in question.
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