Beer is made through the centuries-old process of fermenting sugared water using barley, hops, yeast and water. It provides nutritional benefits and was important in history where water quality was poor. The main ingredients - barley, hops, yeast and water - each contribute different flavors and characteristics to beer. Barley provides body, malt flavors and color. Hops add bitterness, aroma and foam stability. Yeast is the microorganism that produces alcohol and carbon dioxide through fermentation. Water quality also influences beer flavors. There are many styles of beer divided into ales, which are top-fermenting, and lagers, which are bottom-fermenting. The craft beer market