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