Wool fat, also known as lanolin, is a natural wax produced by the sebaceous glands of sheep. It is composed of fatty acids, esters, alcohols, and hydrocarbons. Lanoline and lanolin are two different names for the same substance, with lanolin being the more common name. Lanoline is an emollient, meaning it helps to soften and protect the skin. It is often used in cosmetics, soaps, and other skin care products.