What is meant by the concept of linked code in programming?

The concept of coupled code in programming means that different parts of a program (modules, classes, functions) are highly dependent on each other. This is evident when a change in one component requires changes in another.

High coupling complicates code maintenance and testing, and reduces its flexibility. In C/C++, this can manifest through the direct use of global variables, tight interaction between modules without clear interfaces.

An example of low coupling is the use of abstractions and interfaces, which allow changing the implementation without affecting other parts of the program.