Defining a function means to teach the computer a new command and explain what it should do when receiving that command.
Calling a function actually gives the command, so the computer will run the code for that function.
In Python functions, the function body is the indented block of code that comes after the `def my_function():` line. The function body is what will be executed when the function is called.
`snake case` refers to the style of writing in which each space is replaced by an underscore `_` character and the first letter of each word is lowercase.
