紅茶, or "black tea," is a type of tea that is fully oxidized, giving it a rich flavor and dark color. It is one of the most popular tea varieties worldwide and is often enjoyed plain or with milk and sugar. The leaves of the Camellia sinensis plant are processed through withering, rolling, oxidizing, and drying to create this distinctive beverage. This tea is known for its higher caffeine content compared to green tea and white tea, making it a popular choice for those seeking an energy boost. Additionally,紅茶 is often used as a base for flavored teas, such as Earl Grey and chai, enhancing its versatility in various cultures.