Coupling is the act of joining two things together. In software development, coupling refers to the degree to which software components are dependant upon each other. For instance, in a tightly-coupled architecture, each component and its associated components must be present in order for code to be executed or compiled. In a loosely-coupled architecture, components can remain autonomous and allow middleware software to manage communication between them. In a decoupled architecture, the components can operate completely separately and independently.
Key benefits of architecting loosely coupled SOA-based solutions
Service-oriented architectures (SOA) experience...(TheServerSide.com)
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