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Modularity is a concept that divides systems into smaller, autonomously functioning modules. This structure enables adjustments, maintenance, and scaling without affecting the entire system core. It encourages innovation and flexibility in software development.
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Modularity is the decomposition of a system into cohesive, encapsulated units with clear responsibilities and limited dependencies.
Modularity developed as a response to growing system complexity and the need to isolate changes. Software engineering made it concrete through encapsulation, separation of concerns, and reusable design patterns.
Cut a system along meaningful responsibilities: knowledge may be close inside a module, while a small stable interface matters between modules. Good modularity reduces the number of places a change must touch.
Related responsibilities stay closely together inside a module.
Dependencies between modules remain visible, limited, and deliberate.
A contract protects implementation details and enables independent change.
Modularity improves changeability, comprehension, and parallel work. It is a property of different architectures, not a synonym for a modular monolith or microservices; artificial boundaries add cost.
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