Dairy products. Yogurt milk powder is a kind of dairy product made by mixing yogurt bacteria, milk or milk powder, sugar and other raw materials, fermenting and drying. It has the advantages of strong sour taste, delicate taste and rich lactic acid bacteria. Therefore, sour milk powder belongs to dairy products. Dairy products refer to all kinds of foods or drinks containing dairy products, with raw milk, dairy products or refined dairy products as raw materials. These include yogurt, sour milk powder, milk, milk powder, cheese, butter and so on. Among these products, sour milk powder is a kind of dairy product with rich nutrition and easy storage and use.