Library and namespace. What is the difference?

Question

C++ / C#

Why a library and a namespace in C++ are not the same. Both the library and the namespace contain functions and operators created by other programmers, as I understand it. For example, "iostream" contains certain functions and "std" contains functions, but iostream is a library and std is a namespace. Maybe I didn't read it right or didn't get the point. Please explain what is the difference between them?

Answer 1

You have some strange terminological mess.
First, "library" and "namespace" are entities that have nothing in common even remotely. Your question sounds like "what is the difference between a crow and the area of ​​a triangle". It is impossible to answer such a question without further explanation - it is meaningless.
Secondly, there is no "iostream library" and there never was. Why are you suddenly calling "iostream" a "library"? C++ has a standard header <iostream> containing descriptions of entities from the C++ standard library . But the header is not a library at all. Nobody considers it <iostream>a "library". Why are you suddenly doing this?

Answer 2

A library can have many namespaces!

Answer 3

When you write code, you are working with a namespace.
After you have compiled your program and run it, the program works with the library, there are no more namespaces there.
A library can have several namespaces or not one (more precisely, the entire library is placed in one global namespace).
If you go down, then the library is a *.dll and / or *.lib file (for Windows), the namespace is declared in *.h files.