Black tea is a type of tea that is more oxidized than green, oolong, and white teas. It is known for its robust flavor, which can range from malty to smoky, depending on the specific variety and how it's processed. Generally, black tea has a darker appearance compared to other teas and tends to have a higher caffeine content. It is commonly enjoyed with or without milk and sugar and is popular in various cultures around the world, including in Western countries and regions like India and Sri Lanka.