What is linking in C++.....?

Question

I understand some terms like compilation( Process ofturning the source code to language of the computer) and preprocessor directives but what is the linking process?

Answer 1

the compiler makes multiple obj files and leaves placeholders in the main obj file.
These placeholders are replaced by the linker, which gets the missing parts out of the other obj files. The linker "links" the different files of machine code