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 way. 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.

According to a 2011 census, about 730 million tons of milk are produced from 260 million dairy cows in the world's dairy farms.  India is the largest producer of milk in the world.  India's contribution to the world's total milk production is 18.5%.[1]  Apart from that, India also leads in the export of skim milk powder.  Due to increasing domestic demand of milk and its by-products in India, milk imports are likely to occur in the near future.The practice of obtaining milk for food from non-human mammals dates back to the Neolithic or the beginning of agriculture.  Its development occurred in Southeast Asia between 7000 and 9000 BC and in America between 3500 and 3000 BC.

Milk has been extracted from dairy cows, buffaloes, goats and camels in early times.  Milk has been used in early South Asia from wild animals.  Domesticated animals have been used for leather and meat.  Then from four BC, mammals were domesticated and milk was obtained from them.  The practice of obtaining milk from mammals spread from South Asia to Europe from around 7 BC.  From there it spread to Arabia and African continents.Milk on the list of agricultural products is milked from non-human animals after their conception.  Mammals are all animals that have external ear lobes, fur on the skin, and mammary glands.  Humans use the milk of some of these animals as food.Milk and milk products are nutritious and healthy foods.  It contains natural nutrients like calcium, potassium, protein etc.
Milk gives skin glow.
Due to its high calcium content, it strengthens the bones.
Milk reduces the risk of cardiovascular diseases.