Pu'er or Pu-erh is a variety of fermented tea traditionally produced in Yunnan Province, China. In the context of traditional Chinese tea production terminology, fermentation refers to microbial fermentation (called 'wet piling') and is typically applied after the tea leaves have been sufficiently dried and rolled.
 
In China, pu-erh tea has long been sipped to achieve a variety of health benefits, such as improvements in heart health and reductions in cholesterol levels. It's also said that pu-erh tea can help promote weight loss, enhance eyesight, stimulate circulation, and soothe hangovers.