Understanding Gang of Four's Facade Design Pattern

TL;DR: use Facade Design Pattern to simplify usage of a complex subsystems and reduce number of dependencies your code has

During recent Design Patterns training I've attended at Inviqa (delivered by @_md) we had quite emotional discussion about differences between Facade and Adapter patterns (which are intuitively different but it was hard to understand why). This discussion led me to this blog post and I'd like to summarise our conclusions.

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