Milk

 is a nutritious fluid secreted by the mammary glands of the young mother (female animal) of the mammal species. It is used as a nutrient-dense food for the young of young mammals. The mother's baleen is the primary food until the cubs are able to digest other foods. The yellow color given to the calf in the initial period is called colostrum. This milk provides the necessary immunity from the mother to the baby. Milk and milk products are nutritious and healthy foods. It contains natural nutrients like calcium, potassium, lactin (protein) and lactose (double sugar). Many by-products can be obtained from milk through chemical changes of milk. Curd can be obtained by fermenting milk, curdling (a). Then curd can be used to obtain fat-rich butter and watery whey as a by-product. Ghee can be distilled to obtain aromatic and flavorful ghee. Cheese can also be obtained by fermenting milk.