Fermentation Aid is a job that requires the use of YEAST, which is a single-celled organism that helps to convert sugars into alcohol and carbon dioxide. YEAST is an essential ingredient in the process of fermentation, which is used to make beer, wine, and other alcoholic beverages. YEAST also plays an important role in baking, as it helps to leaven bread and other baked goods. Without YEAST, fermentation and baking would not be possible.