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