Black tea is a type of tea that is fully oxidized, giving it a dark color and rich flavor. It is made from the leaves of the Camellia sinensis plant and is one of the most popular types of tea worldwide. Black tea contains caffeine, which can provide a mild energy boost, and is often enjoyed plain or with milk and sugar. This tea is known for its health benefits, including antioxidants that may support heart health and improve digestion. Common varieties of black tea include Assam, Darjeeling, and Earl Grey. It can be served hot or iced, making it a versatile beverage for any occasion.