black tea is a kind of tea made from leaves of "camellia sinensis". often, it is stronger in taste than other varieties of tea, like green tea or oolong. it also has more caffeine. in some parts of the world, like china, it is called "red tea", a description of the colour of the liquid. the western term "black tea" comes from the color of the tea leaf. it has been traded a lot because it could be kept longer. it is generally the preferred form of tea in the west. all people consumed tea in a daily life routine. tea is the most-consumed thing in the world after water. one of the best tea is black tea and its benefits is very effective.