Well, in this case
Food is a function parameter also know as a function variable or an argument.
As you should know by now a variable can be anything we decide to make it, in the case of a function each parameter is assigned the value in the order it is listed unless you name them and describe them by name,
def function_call(p_one, p_two, p_three):
print(p_one, p_two, p_three)
Now we can call this function two primary ways, one we can just throw three different values in our call and it will function correctly but as I said before the values will be assigned in the order they are declared.
function_call(3, 2, 1)
# OUTPUT: 3 2 1
We can also call it like the following
function_call(p_three=3, p_one=1, p_two=2)
# OUTPUT: 1 2 3
Now as you can see the order does not matter in this case because when we declared the function the order is predetermined. So when we we use the name of the parameter in the function call that is called a key word argument.
We can use any combination of the two above when calling a function but the order must ALWAYS be unnamed arguments followed by key words
function_call(1, 2, p_three=3)
If you mess this up it will simply throw an error and tell you where you did so.
Needless to say though that variables in a function allow us to do some magical things with programming.
Before I forget to mention this,
This inherently breaks out of a function. Once you call return there is no going back in a function. You have to do all work you need done before you call the return.