This Brewing process diagram depicts malting, milling, mashing, extract separation, hop addition and boiling, removal of hops and precipitates, cooling and aeration, fermentation, yeast separation from young beer, aging, maturing, and packaging. This diagram of the Brewing process diagram also depicts the various stages of beer production. Although brewing beer is a simple process, accurately influencing the multiple steps to achieve a desired and consistent result. Fermentation is how yeast converts sugars into alcohol, carbon dioxide, and heat. Most traditional beers are made with sugars derived primarily from malted barley, though other cereal sources and plant sugars can also be used.