What is the role of the Include directive in the modular development process and why is it used?

In C#, there is no Include directive like in some other languages (e.g., C/C++). However, in the context of modular development, it is common to talk about including files or modules to organize code.

If we consider similar mechanisms, in C#, code is divided into parts using namespaces, classes, and files, as well as the using directive to include namespaces.

In other languages, such as C/C++, the #include directive is used to include the contents of one file into another during preprocessing, which allows breaking the program into modules and reusing code.

Thus, the role of the Include directive (in a general sense) is to ensure modularity and code reuse, facilitate maintenance and development of the project, and allow dividing code into logical parts.