What is fermentation? What are the 2 types of fermentation? what organisms use fermentation

Fermentation= is metabolism in which energy is derived from the partial oxidation of an organic compound using organic intermediates as electron donors and electron acceptors.

types=Propionic acid fermentation and Homolactic Fermentation

Organisms that use fementation=Enterobacteriaceae,Lactobaci… clostridium,escherichia acetobacter etc