Brewing yeast is a microorganism used in the fermentation process to produce alcoholic beverages like beer and wine. The most common type of brewing yeast is Saccharomyces cerevisiae, which converts sugars into alcohol and carbon dioxide. This process not only creates alcohol but also contributes to the flavor and aroma of the final product. Different strains of brewing yeast can impart unique characteristics to the beverage. For example, lager yeast ferments at cooler temperatures, resulting in a clean and crisp taste, while ale yeast ferments at warmer temperatures, producing more fruity and complex flavors. The choice of yeast is crucial for achieving the desired profile in brewing.