A fully oxidized tea known for its dark color and bold flavors, black tea is produced primarily in countries like India, Sri Lanka, and China. It typically contains more caffeine than other tea types, with a range of flavors from malty and brisk (e.g., Assam and Ceylon) to smoky and robust (e.g., Lapsang Souchong). Black tea can be enjoyed plain or with milk and sweeteners, and it serves as the base for blends like Earl Grey and English Breakfast.