Question

What is fermentation?

Answer 1

Fermentation is a metabolic process that consumes sugar in the absence of oxygen. The products are organic acids, gases, or alcohol. It occurs in yeast and bacteria, and also in oxygen-starved muscle cells, as in the case of lactic acid fermentation. The science of fermentation is known as zymology.

In microorganisms, fermentation is the primary means of producing ATP by the degradation of organic nutrients anaerobically.[1] Humans have used fermentation to produce foodstuffs and beverages since the Neolithic age.

Answer 2

Hey mate ^_^

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Fermentation:
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It can be defined as the anaerobic (without oxygen) breakdown of carbohydrates by microorganisms to produce alcohol, organic acids, and other compounds along with energy and gases. 

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For example:
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Alcoholic fermentation is breakdown of glucose into ethanol and carbon dioxide in the absence of oxygen.

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