Black tea is a large and diverse category, and what differentiates it from other tea varieties is heavy oxidation—in the process, the tea leaves of the Camellia sinensis plant attain their distinctive dark color and develop earthy notes.
When brewed, black tea will usually have a typical amber or brownish hue and stronger flavors and aromas, which may range from savory to sweet and include typical earthy, malty, nutty, and fruity nuances. However, since there are numerous variations and blends available, the final taste profile may significantly vary.
Most historians believe that it originated in Fujian. British and Dutch traders then exported the tea to Western markets, and although in its native country, black tea did not enjoy great success, in the West, it became the most popular tea variety.