Tannins are natural compounds found in many plants, especially in the bark, leaves, and fruits. They are responsible for the astringent taste in foods and drinks, like red wine and certain teas. Tannins can create a dry feeling in your mouth, which is why they are often associated with the flavor profile of red wine. These compounds also play a role in the health of plants by protecting them from pests and diseases. In addition to their taste and protective qualities, tannins have antioxidant properties, which can be beneficial for human health when consumed in moderation, such as in green tea or dark chocolate.