Oligosaccharides are carbohydrates that consist of a small number of monosaccharide units, typically ranging from two to ten sugar molecules linked together by glycosidic bonds. They are found in various natural sources, including vegetables, legumes, and whole grains, and play important roles in nutrition and gut health. Oligosaccharides can act as prebiotics, promoting the growth of beneficial gut bacteria, and may also have various health benefits, including improved digestion and immune support.