Fermentation is the process by which yeast converts the glucose in the wort to ethyl alcohol and carbon dioxide gas -- giving the beer both its alcohol content and its carbonation. To begin the fermentation process, the cooled wort is transferred into a fermentation vessel to which the yeast has already been added.

In the context of brewing beer, fermentation is the conversion of sugars into alcohol and carbon dioxide by yeast. This magical transformation is what gives beer its unique flavors, aromas, and characteristics.

Beer is produced by the process of brewing and fermentation of starch present in the grains such as malted wheat, rice, maize, and oats. Beer can also be produced at home via a home brewer. The fermentation of the starchy sugars by the yeast results in ethanol production and carbonation in the final product.

Fermentation is the process whereby “sugars” are converted by yeast to alcohol, carbon dioxide, and heat. In the brewing of most traditional beer, the sugars are derived mainly from malted barley, although other cereal sources and other plant sugars can also be used.