Answer Posted / snigdhadeb ash.

Namespace is a new concept introduced by the ANSI C++
standards committee. This defines a scops for the
identifiers that are used in a program. For using the
identifiers defined in the namespace scope we must include
the using directive,like
using namespace std;
Here , std is the namespace where ANSI C++ standard class
libraries are defined. All ANSI C++ programs must include
this directive. This will bring all the identifiers defined
in std to the current global scope. using and namespace are
the new keywords of C++.

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