0:00:00.340,0:00:06.570
One of the great things in computer programming[br]is once you've taught a computer how to do

0:00:06.570,0:00:18.110
an action, you can call that function again.[br]You give it a name and then you can call it.

0:00:18.110,0:00:24.699
That's really like extending the language.[br]In the program we built, we learned how to

0:00:24.699,0:00:34.880
draw a square by moving and turning four times.[br]We can take that function and give it a name,

0:00:34.880,0:00:42.170
draw a square, so that any time we want to[br]do that, we simply say draw a square and it

0:00:42.170,0:00:49.719
will go back and invoke that function, that[br]code. It will get done for us. We've added

0:00:49.719,0:00:53.190
that concept to our programming language.