Loose coupling is an AWS best practice that refers to achtecting/arranging config elements in a way that is fault-tolerant, avoid single points of failure. The opposite of a loosely coupled architecture is a brittle architecture.
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A loosely-coupled architecture is one in which the system’s individual elements do not directly depend on any one other element to the point of one’s failure bringing the system to a halt.
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a brittle architecture is just as it sounds: it breaks easily. Single points of failure define a brittle cloud architecture.