what is modules?

Question

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Answer 1

The first answer actually answered the question "What is the modulo operator?" not "What is a module?". Therefore I will answer the question "What is a module?".
A module is a new concept which is evaluated for C++17 at the moment. clang++ 3.9 and the Visual Studio compiler (I think not the one bundled with Visual Studio 2015 but updated later on) implements it.
Taken from the clang 3.9 module feature description: "Modules provide an alternative, simpler way to use software libraries that provides better compile-time scalability and eliminates many of the problems inherent to using the C preprocessor to access the API of a library."

Answer 2

Ok, to improve on the answer "What is modulo?": modulo is an operation which will give you the remainder of division. modulo is expressed by the "%" operator and can only be applied to integer numbers.
An example:
int remainder = 11%4; // remainder=3, as 11=4*2+3
I hope this and my other answer help to understand what "modulo" or "modules" in C++ is.

Answer 3

11=4*2+3 ,so,11%4=3 ;and,11%5=1,11%6=0……