Brew is a term used to describe the process of fermenting or fomenting. Fermenting is the process of converting carbohydrates into alcohol or organic acids, while fomenting is the process of stirring up public opinion or excitement. Both processes involve the use of yeast, bacteria, or other microorganisms to convert sugars into alcohol or acids. Brewing is an ancient practice that has been used for centuries to make beer, wine, and other alcoholic beverages.