Pu'er tea is a style of dark tea that's grown in the Yunnan province of China. It’s named after the city of Pu'er. This tea is mainly categorized as a dark tea (black tea is the direct translation from Chinese) that goes through fermentation during and/or after its processing. Fermentation refers to the microbial activity which is typically happening or purposely initiated after the tea leaves have been sufficiently dried and rolled. Pu'er can be divided into two main categories, shēng, and shóu pu'er. They differ based on the kind of fermentation that takes place in or after their processing. In its final form pu'er is usually pressed in cakes or bricks, which can weigh 100g to 5kg, while 357g is the most common cake weight.