getch() takes one char from keyboard but it will be invisible to us. in other words we can say that it waits until press any key from keyboard.
getch() is a function which has its protype defined in conio.h header file.
it is basically used to take input a single characterfrom keyboard. and this char is not displayed at the screen.
it waits until itn gets a input that's why it can be used as a screen stopper.