Cohesion: A cohesive module performs a single task, requiring little interaction with other components.
Coupling: A Coupling is an indication of the relative interdependence among modules.
Difference between cohesion and coupling
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Cohesion
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Coupling
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Cohesion is the indication of the relationship within module.
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Coupling is the indication of the relationships between modules
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Cohesion shows the module’s relative functional strength.
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Coupling shows the relative independence among the modules.
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Cohesion is Intra – Module Concept.
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Coupling is Inter -Module Concept.
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While designing you should strive for high cohesion i.e. a cohesive component/ module focus on a single task
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While designing you should strive for low coupling i.e. dependency between modules should be less.
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Cohesion is the kind of natural extension of data hiding for example, class having all members visible with a package having default visibility.
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Making private fields, private methods and non-public classes provides loose coupling.
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