Originating in Yunnan, Raw Pu-erh Tea (Sheng Pu'er) is a classic example of post-fermented tea, famous for the saying, "the older, the better." It is commonly found in various forms, including tea cakes, dragon balls, loose-leaf tea, and tuocha.

When stored naturally in a clean, dry environment, raw Pu-erh undergoes a gradual aging process, transforming over time into a tea with a smoother, richer taste and a more complex aroma. This transformation is the inspiration behind the saying cherished by tea enthusiasts: "Store new tea, drink aged tea."