Why and how should I use namespaces in C++?

Question

I have never used namespaces for my code before. (Other than for using STL functions)

1. Other than for avoiding name conflicts, is there any other reason to use

Answer 1

It can help you for a better comprehension.

eg:

std::func <- all function/class from C++ standard library
lib1::func <- all function/class from specific library
module1::func <-- all function/class for a module of your system

You can also think of it as module in your system.

It can also be usefull for an writing documentation (eg: you can easily document namespace entity in doxygen)