A milk substitute is any substance that resembles milk and can be used in the same ways as milk. Such substances may be variously known as non-dairy beverage, nut milk, grain milk, legume milk, mock milk and alternative milk.
For adults, milk substitutes take two forms: plant milks, which are liquids made from plants and may be home-made or commercially produced; and coffee creamers, synthetic products invented in the US in the 1900s specifically to replace dairy milk in coffee. For infants, infant formula based on cow's milk or plant-based alternatives, such as soybean, can be a substitute for breast milk.