So far we discussed monosaccharides and disaccharides. Now let's move on and talk about polysaccharides. So what exactly is a polysaccharide and what's the purpose of polysaccharides in nature? Well, a polysaccharide is basically a very large carbohydrate that consists of many, many individual monosaccharides which are connected by Oglycoacetic bonds and the ore. Organisms in nature, including our own cells, use polysaccharides for one of two purposes. They either use polysaccharides as a form of storing energy. So we basically store glucose, as we'll see in just a moment, in the form we call glycogen, which is a polysaccharide.