Why not conio. h??

Question

we have been taught to write #include<conio.h> after iostream. Then why do we use namespace std???

Answer 1

<conio.h>, <iostream.h> all belongs to pre-standard C++, which is now obsolete.

https://www.sololearn.com/Discuss/288609/?ref=app

Answer 2

conio.h is a C header file used mostly by MS-DOS compilers to provide console input/output. It is not part of the C standard library or ISO C, nor is it defined by POSIX.

The std namespace includes features of the C++ Standard Library.
and also it enhance the program visual activites by ignoring white spaces ..it is a predefined one in C++ to enhance the performance