How is yeast used to produce beer from barley?

Yeast is a crucial ingredient in beer production, as it ferments the sugars derived from barley. During the brewing process, barley grains are malted and then mashed to convert starches into fermentable sugars. Yeast is added to the wort (the liquid extracted from the MASH), where it consumes the sugars and produces alcohol and carbon dioxide, creating beer. This fermentation process typically lasts from several days to weeks, depending on the desired beer style.