Fermented milk products are dairy products that have been fermented with lactic acid bacteria. Yoghurt and yogurt are two of the most popular fermented milk products. Yoghurt is a thick, creamy product made from milk that has been fermented with lactic acid bacteria, while yogurt is a similar product that is thinner and less tart than yoghurt. Both yoghurt and yogurt are high in protein and calcium, and are often used as a healthy snack or breakfast food.