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Milk is a nutrient-dense liquid secreted by the mammary glands of mammals to nourish their offspring. In culinary contexts, cow's milk is the predominant form used globally, though milk from goats, sheep, buffalo, and other animals serves important roles in various regional cuisines. Milk is composed of water, lactose (a natural sugar), casein and whey proteins, milk fat, and essential minerals and vitamins. Its flavor profile ranges from subtly sweet to rich and creamy, depending on the animal source, diet, and processing method.

The primary varieties used in cooking include whole milk (full fat content, typically 3.5–4%), reduced-fat milk (2%), low-fat milk (1%), and skim milk (fat-removed). Processing methods—such as pasteurization, ultra-high temperature (UHT) treatment, and homogenization—affect shelf stability, texture, and cooking properties. Regional milk products like buffalo milk (common in South Asia and the Mediterranean) and goat's milk (prevalent in Mediterranean and Middle Eastern cuisines) offer distinct flavor and textural characteristics.

Milk serves as a foundational ingredient across global cuisines, functioning both as a primary component and as a binder, thickener, or enrichment agent. It is essential in the preparation of sauces (béchamel, cream-based sauces), soups (chowders, cream soups), custards, puddings, and baked goods where it contributes moisture, tender crumb structure, and browning. In beverages, milk forms the base for coffee, tea, hot chocolate, smoothies, and traditional drinks like Indian lassi. Dairy-dependent cuisines use milk in preparation of paneer, ghee, and yogurt, while Western baking relies on milk for everything from bread doughs to delicate cakes and pastries. The fat content affects richness and texture—whole milk creates luxurious sauces, while lower-fat varieties suit lighter preparations.