Black tea is a completely oxidized (fermented) tea. Black tea, or as it is known in China - hong cha (red tea), was originally only for export to the foreign markets. In China it is called red tea in reference to the color of the infused liquid or to the red edges of the oxidized leaves, as opposed to the color of the main body of the processed tea leaves. At one time, black tea was considered of lesser quality and not desired by the Chinese themselves and therefore, was exported. Which is why, to this day, black tea is what everyone outside of China thinks of when talking about tea, whereas, tea in China is understood to mean green tea.