Tea is the world's most consumed beverage after water. All types of tea come from the same plant, Camellia Sinesis. The differences in tea depend on the geographical location where it is grown, growing conditions, and how it is harvested and processed. There are over 3,000 varieties of tea. These varieties can be classified into five main types of tea: black, green, oolong, white, and pu-erh. There are other teas, such as herbal and rooibos that are not made from the tea plant, Camellia Sinesis. Herbal teas, also called tisanes, are made from herbs, spices, dried fruits, and other plants. Rooibos is made from the South African red-bush, Aspalathus linearis. Rooibos and herbal teas are naturally caffeine free.