They can be eaten directly. They are all dairy products. Cream refers to dairy products obtained by centrifugal separation, ripening, stirring and squeezing of milk. Cream is rich in nutrition, and the main component is cream. Butter is made by separating thin cream from skim milk, ripening the thin cream and stirring it. The biggest difference between butter and cream is the composition, and the fat content of butter is higher. High-quality butter is light yellow in color, even and delicate in texture, with no moisture oozing from the cut surface and fragrant in smell. Cheese and cheese are the same thing. It is a fermented dairy product, and its properties are similar to ordinary yogurt. Both of them are made by fermentation technology, and both contain lactic acid bacteria which can be used for health care. However, the concentration of cheese is higher than yogurt, and it is similar to solid food, so its nutritional value is richer.