Herbal tea or tisanes, is a term used for any non-caffeinated beverage
made from the infusion or decoction of herbs, spices, or other plant
material in water. These drinks are distinguished from caffeinated
beverages like coffee, and the true teas, or from a decaffeinated tea,
in which the caffeine has been removed. In addition to serving as a
beverage, many tisanes are also consumed due to a perceived medical
benefit. Like beverages made from the tea bush, tisanes can be served
hot or cold. Tisanes have been used nearly as long as written history extends.