There's two ways to output information from functions. They can print

something or they can return something. So, should we print or return?

Most of the time returning makes functions much easier to use. Think

about the `input()` function. It asks the user to enter something, and

then the user enters something and that value is returned. If the input

function would print the value instead of returning it, things like

`name = input("Name: ")` wouldn't work and assigning the output to a

variable would be much more difficult. Printing things is fine when you

know that you'll only need to print the result and you'll never need to

assign it to a variable.

- Functions are a way to write code once, and then use that same

code in multiple places.

- Variables inside functions are **locals**, and variables outside

functions are **globals**. Functions can access all variables, but

by default, they can only create and change the value of local

variables.

- Functions can take **arguments** and they can behave differently

depending on what arguments they get. Functions can also

**return** one value. Returning also ends the function immediately.

- Return a value instead of printing it if you need to do something with

it after calling the function.

**There is a lot to learn about functions, and I don't expect you to