The document discusses fermentation and vitamin B2. It defines fermentation as a metabolic process where microorganisms convert organic substrates through enzyme action. There are two main types of fermentation: aerobic and anaerobic. Factors like temperature, concentration, pH, and other substances affect the fermentation process. The process involves glycolysis producing pyruvic acid and its subsequent reduction. Applications of fermentation include food production. Vitamin B2 (riboflavin) is required for normal cell function and processes like skin development, digestion, blood cells, and brain function.