In China, there have 6 kinds of teas which are Green Tea, Black Tea, Dark Tea, Yellow Tea, Oolong Tea, White Tea.
Actually, all the different kinds of tea come from the same plant (Camellia sinensis). The differences of 6 kinds of tea lie in their processing, particularly, the fermentation degree that the leaves undergo.
Green - no fermentation
Black - fully fermented
Dark – fully and Post fermented
Yellow- slightly fermented
Oolong - partly fermented
White –no fermentation
Herbal teas and rooibos tea are NOT true teas, as they come from different plant sources.