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1. COntent couping:- one class can access private members of others class
2. COmmon coupling : Two classes access same shared data.
3. Control coupling: When a function controls flow of another function
Routing Coupling: When a function calls another function without passing any parameter
Data coupling :- Same database
Type use Couping : Return type same
Stamp Coupling : Class B has method paramter of A
Import Coupling : Library is imported in another program
External Coupling : External program