茶叶, or tea leaves, are the dried leaves of the 茶 plant, primarily the Camellia sinensis species. These leaves are used to produce various types of tea, including 绿茶 (green tea), 红茶 (black tea), and 乌龙茶 (oolong tea). The processing methods and oxidation levels of the leaves determine the flavor, color, and aroma of the final beverage. Tea has a long history, originating in ancient China, where it was first consumed for its medicinal properties. Today, 茶叶 is enjoyed worldwide, often served hot or cold, and is known for its potential health benefits, including antioxidants and calming effects.