Dark tea is a unique post-fermentation tea in China, with "withering and pile-fermentation" as its core process. Its dried tea is dark and lustrous, the tea soup is red and thick, and the taste is smooth and mellow, with a unique aged aroma or yeast aroma. It becomes even more fragrant with age. Representative varieties include Anhua Dark tea, Pu'er aged tea, and Liubao tea, etc. Historically, it was the "life-giving drink" in border areas, known for aiding digestion and relieving greasiness. It is a warm, healthy, and long-lasting collectible tea.