[Haskell-cafe] Currying: The Rationale

Hi What is the rationale behind currying? is it for breaking subroutines into pure one-to-one mappings? If f x y = f x -> a function which takes y for argument then does that mean that the second function already has value x, as it were, built into it? The syntax in Haskell is perfectly lucid and almost intuitive; unlike the underlying theory which is a bit ... top marks for the least jargoned answer. Many thanks in advance, Paul