sweet butter

"Sweet butter" is a term used to describe unsalted butter. This should not be confused with "sweet cream butter," which can be either salted or unsalted. Butter is an emulsion of fat globules, water, and inorganic salts, produced by churning the cream from cow's milk.12

Commercial butter typically consists of 80-82% milk fat, 16-17% water, and 1-2% milk solids. Producing one kilogram of butter requires approximately 20 liters of whole milk. The process of churning destabilizes the cream emulsion, separating butterfat granules from the liquid serum, known as buttermilk. The butterfat is then washed and worked to remove excess buttermilk before packaging. Butter is a high-energy food, providing about 715 calories per 100 grams.123