What Is a Module?
Modules are files that can be compiled separately. The result of compiling these modules is a set of compiler output files. These files can be brought together by a linker to generate a single program you can run.
You've already made use of a module—iostream—in previous lessons.
Two files—a header file (ending in .h) and an implementation file (ending in .cpp)—make up a C++ module. main.cpp is the only exception to this rule. It is an implementation file that never has an accompanying header file.
Implementation
 | The part of a program that contains the code that can be run. A header declares the allowable ways to call on that code. ... |
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