
1) Software design pattern
Found on
https://www.crosswordclues.com/clue/facade-pattern

The facade pattern (or façade pattern) is a software design pattern commonly used with object-oriented programming. The name is by analogy to an architectural facade. A facade is an object that provides a simplified interface to a larger body of code, such as a class library. A facade can: The Facade design pattern is often used when a system is ...
Found on
http://en.wikipedia.org/wiki/Facade_pattern
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