Check out example codes for "what is conio.h". It will help you in understanding the concepts better.

Code Example 1

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 it is defined by POSIX. This header declares
several useful library functions for performing "console input and
output" from a program.

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