A function is similar to a variable because both work coherently.

Functions can be helpful in breaking down big problems as you can assign them a specific value so you can use the function instead of continous copy and paste. Which helps save time and helps make the code less cluttered.
A example is giving the function a specific variable such as (X = Y (line of code)) that you can use in smaller bits of code to help break it down.

shapes.py

@@ -15,6 +15,14 @@ def triangle(side_length):
     
 
 def rectangle(height, width):
-    pass
+
+    forward(height)
+    right(90)
+    forward(width)
+    right(90)
+    forward(height)
+    right(90)
+    forward(width)
+    right(90)