At this point in our training, you need to learn that all values in Haskell are immutable! But what does it mean for us? It means that when you apply a function to some argument, the value of that argument cannot be changed. Instead, you create a new value each time. That means "variable assignment" does not exist in Haskell. Instead, we only assign a name to an expression and we know that that name will always evaluate only that expression.