Which sugar is known as milk sugar?

Lactose is known as milk sugar because it is the primary sugar found in the milk of mammals. It is a disaccharide composed of two simpler sugars: glucose and galactose. This unique composition distinguishes it from other sugars such as glucose, which is a monosaccharide and a primary energy source for the body; maltose, which is also a disaccharide made up of two glucose molecules and is found in malted foods; and sucrose, which is table sugar composed of glucose and fructose and is commonly found in plants. Lactose plays a crucial role in human nutrition, particularly for infants, as it provides energy and aids in the absorption of calcium and other minerals. The presence of lactose is a defining characteristic of mammalian milk, making it the sugar specifically referred to as milk sugar.