Which Programming Language should you learn? I'd definetly recommend HTML and CSS

Was joking with my sister about who has more steps. She had done more steps so far, so I said that I would walk 20 times around the McDonald's, where we were going to eat. She replied that she would walk 50 times around it, so I said that I would walk 2 times more around it than she would. She then said, that she would go once more around it. In the end, I explained recursion and infinite loops to her. Her comment was "großer Blödsinn" (German) -> "big bullshit".

Explain the 'Script' to Java. Why the Fuck would you want to do so?