Tannin is a naturally occurring polyphenolic compound found in various plants, particularly in the bark, leaves, and fruits. It is responsible for the astringent taste in foods and beverages, such as wine, tea, and certain fruits. Tannins can bind to proteins, which is why they can create a dry sensation in the mouth. In addition to their flavor profile, tannins have antioxidant properties and may offer health benefits. They are often studied for their potential effects on heart health and inflammation. Tannins also play a role in the preservation of wood and are used in the tanning process of leather.