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Aside from the Grains and Hops, another important ingrediant in the production of beer is Yeast. Yeast is a microorganism. It is responsible for fermentation in beer, and it also influences the character and flavour. Yeast metabolizes the sugars extracted from grains, which produces alcohol and carbon dioxide, and thereby turns wort into beer. Most beers are made from ale yeast (Saccharomyces cerevisiae) and lager yeast (Saccharomyces uvarum); their use distinguishes ale and lager. Before the role of yeast in fermentation was understood, fermentation involved wild or airborne yeasts. A few styles such as lambics rely on this method today, but most modern fermentation adds pure yeast cultures directly to wort.
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Beer and Wine
Maker 
