How are microbes useful in fermented beverages?

(N/A) Microbes,especially yeasts,have been used since time immemorial for the production of beverages like wine,beer,whisky,brandy,or rum.
For this purpose,the same yeast,$Saccharomyces \ cerevisiae$,used for bread making is utilized.
This is commonly called brewer's yeast and is used for fermenting malted cereals and fruit juices to produce ethanol.
Depending on the type of raw material used for fermentation and the type of processing (with or without distillation),different types of alcoholic drinks are obtained.
Wine and beer are produced without distillation,whereas whisky,brandy,and rum are produced by distillation of the fermented broth.