1. The difference between milk powder and milk. Milk powder and milk are two common drinks in our daily life. They are both made of milk. However, there are still many differences between them. First of all, milk powder is made after processing, while milk is squeezed directly from the mammary glands of cows. Secondly, milk powder can be stored for a long time without spoiling, while milk needs to be refrigerated to stay fresh. In addition, in terms of nutritional content, although both are rich in protein, calcium and other nutrients, milk powder contains more vitamin D and iron. 2. Applicable groups are different due to milk