Doppio and Herbal Tea are produced all around the globe. And they change according to region in where they are cultivated. So, the question arises what is Doppio and Herbal Tea's differentiating factor?In following section we will take a close look at what is Doppio and Herbal Tea color, serving style, types and much more. First thing to know is what are the different types of Doppio and Herbal Tea. Well, Doppio types include Espresso while types of Herbal Tea are Black Tea, Chamomile Tea, Ginger Tea, Lavender Tea, Peppermint Tea, Rosemary Tea, Green Tea, Lemon Balm Tea.