Lactic acid bactaria produce lactic acid by fermentation.

• They are found in curd, they are responsibe for formation of curd from milk by producing lactic acid.

• In humans, they have flora in oral cavity. intestinal tract and vagina where they play a benificial role.

• They are also present in decaying plants

• They have several applications especially in fermentation industry. LAB are involved in making yogurt, cheese, cultured butter, sour cream, sausage, cucumber pickles, olives and sauerkraut.