**Functions** are ways for us to have a program remember code we already wrote and do it again. They're like recipes. We can use functions to teach Tina how to do new things. We make a function by typing `def`, then the function name, a pair of **parentheses** (`()`), then a colon (`:`). Here's the beginning of a function named `first_function`: ```python def first_function(): ``` After a funtion is defined, we can put code inside of it by **indenting** it. Indenting means having four spaces on the front: ```python def first_function(): print "This line is indented 4 spaces!" ``` Once a function is defined, we can **call** it by typing its name and a pair of **parentheses** (`()`). Here's how we'll **call** our `first_function()`: ```python first_function() ``` When we do this, everything inside the function will happen. In this example, there's already a function called `triangle()` defined for you, and it is **called** one time. **Call** it one or more times and see what happens! ```python.run import turtle tina=turtle.Turtle() tina.shape('turle') tina.color('purple') def triangle(): tina.left(60) tina.forward(30) tina.left(120) tina.forward(30) tina.left(120) tina.forward(30) triangle() ``` Ideas for modifying this program: * Change what the `triangle()` says and Tina will do your new instructions. * Try writing your own function and **calling** it as well!