Lactic acid bacteria refer to a kind of gram-positive bacteria with no spores and lactic acid as the main product. Bacteria that can ferment glucose or lactose to produce lactic acid bacteria are collectively called lactic acid bacteria. Lactic acid bacteria is a kind of probiotics existing in human body. Lactic acid bacteria can ferment carbohydrates into lactic acid, and probiotics can help digestion and contribute to the health of human intestines, so they are often regarded as healthy foods and often added to yogurt, so eating some often is very beneficial to the body.