They play an important role in brewing and baking industry. They form alcoholic beverages under anaerobic conditions. S. cerevisiae plays an important role in brewing industry. This species also play an important role in baking industry by forming carbon dioxide and alcohol. They are also used as vitamin rich food. They also spoil food stuffs. They play a vital role in formation of silk. Some of the species like candida albicans attack human beings and lead to thrush and inflammation of genital organs. Some of the species of cryptococcus and torula also attack human beings.