Pu-erh tea is a variety, of post-fermented tea produced primarily in the Yunnan Province of China. A post-fermentation tea, which is a particular type of producing teas in which the tea leaves undergo a fine process of microbial fermentation after the tea leaves are dried and rolled. Pu-erh tea is a very unique type of tea that taste improves with age. Pu-erh tea is usually purchased in the form of a disc, brick, square, bird's nest or cake form, where they compress the tea leaves extremely tightly into these shapes. You can purchase loose leaf as well.
The bricks are called Zhuancha bricks and they are the traditional shape for compressed Pu-erh tea in China, developed for easier transportation through the ancient tea routes by horse caravans. This tightly compressed brick has to be loosened by inserting a tea needle into one of the four corners, when pried properly in will come apart in chunks, revealing the beautiful layers of tea. When brewed each layer of tea has it's own flavor and unique attributes. Pu-erh tea can be re-brewed many times for a different tea drinking experience with every re-brewing.