Getch function >> conio.h Header file >> Library Functions in C Programming

1. Getch accepts character from console (keyboard)
2. Character accepted  does not echoes to the screen [not displayed on screen ]
3. Char entered is not displayed on the screen . 
4. It waits untill it gets a input so it can be used as a screen stopper
5. Header File : conio.h 

int getch(void);

  #include"stdio.h"
  #include"conio.h"

  void main(void)
  {
     char ch;
     printf("Hello"); // Screen is paused until we input a character
     getch();
  }

Hello         // character accepted by getch is not displayed