Black tea is the world's most-consumed category by a wide margin. Most of what is sold in tea bags across the West is black tea — often a blend, often from Kenya or Assam.
But black tea is not only that. In China, where it is called hong cha — red tea — it is a refined category with teas like Keemun and Jin Jun Mei. In Darjeeling it is thin, bright, and vinous. In Assam it is malty and full. The range is enormous.