Since January is National Hot Tea Month, its a great time to learn more about this ancient and increasingly popular beverage. For more than 5,000 years people have been enchanted with tea. From Tanzanian black tea to green tea from Chinas Hunan province, there is a great variety of teas available. Surprisingly, all teas (except for herbal teas) come from the Camellia sinensis plant. How the leaves of the tea plant are processed and their level of contact with oxygen actually determines the type of tea.