My fvorite color is Red.
My favorite city is South Milwaukee.

# COMMENT: so constants are different from variables because once they are defined they are not able to be changed. you are able to use the constants without the variable tag ($) and you just drop them in. how they work in the backend is cool too! before your code compiles, they take 'CITY' in your code and replace it with a literal 'South Milwaukee'. it's very similar to search and replace functions in text editors!