Final answer:
Ethanol is produced through the fermentation of yeast and natural sugars in grains and fruits. It is commonly used in the production of wine, beer, bread, and biofuels.
Step-by-step explanation:
Ethanol is produced through the fermentation of yeast and the natural sugars in grains and fruits. Yeast, a single-celled eukaryotic organism, performs alcoholic fermentation in the absence of oxygen, converting sugars into ethyl alcohol (ethanol) and carbon dioxide gas. This process is used to make various food and drinks, including wine, beer, and bread. Ethanol is also the chief biofuel, accounting for about 80% of the total biofuel production.