Milk is white colored liquid produced only by mammals to feed their young ones. Mammals produce milk through mammary glands. Milk is the primary source of food for newborns. Milk contains all essential nutrients which are required for the growth. Milk plays a major role in the diet. It is a great source of vitamins and minerals. Its composition includes major elements which are needed for body growth and healthy body. It helps the body to be saved from various health issues.