Decaf Coffee and Irish Coffee are produced all around the globe. And they change according to region in where they are cultivated. So, the question arises what is Decaf Coffee and Irish Coffee's differentiating factor?In following section we will take a close look at what is Decaf Coffee and Irish Coffee color, serving style, types and much more. First thing to know is what are the different types of Decaf Coffee and Irish Coffee. Well, Decaf Coffee types include All types of coffee while types of Irish Coffee are No types.