Cold Brew and Fermented Tea are produced all around the globe. And they change according to region in where they are cultivated. So, the question arises what is Cold Brew and Fermented Tea's differentiating factor?In following section we will take a close look at what is Cold Brew and Fermented Tea color, serving style, types and much more. First thing to know is what are the different types of Cold Brew and Fermented Tea. Well, Cold Brew types include Iced Coffee while types of Fermented Tea are Oolong, Black, Pu-erh.