Why using namespace in C++

Question

Namespace with C++

Answer 1

Because you get rid of writing std:: several times in the code.

Answer 2

Namespace is used to prevent name conflict, and to neatly group things by their purpose or functional relativity (not to be mistaken with functional paradigm).

https://en.cppreference.com/w/cpp/language/namespace

https://www.w3schools.in/cplusplus-tutorial/namespace/