Yeasts are unicellular microorganisms, which belong to the fungi kingdom, and are categorized under the Dikarya subkingdom. The yeasts used in food, feed, and beverage applications are mostly found under the Ascomycota phylum, and are some of the most consistent fermenting and raising agents, owing to which, they are used as key ingredients in the food & beverages industry. They improve the aroma, flavor, and elasticity of dough in bakery and confectionery products, and are also used in the manufacture of alcoholic beverages. Specialty yeasts are natural ingredients that are used to enhance the flavor and nutritional profile of food products. Specialty yeasts, such as yeast extracts, yeast autolysates, and yeast derivatives are primarily used as additives for fermenting and improving the organoleptic properties of the final product, as well as for nutrient encapsulation.