Cellulose is a type of complex carbohydrate known as a polysaccharide. It is composed of hundreds to thousands of β(1→4) linked D-glucose units forming a linear chain. Unlike starch and glycogen, cellulose has a straight, unbranched structure with glucose molecules connected by β-glycosidic bonds, giving it rigidity and high tensile strength. It is the primary structural component of plant cell walls and is the most abundant organic polymer on Earth. Cellulose is classified as a complex carbohydrate because it consists of many monosaccharide (glucose) units linked together, making it a polysaccharide rather than a simple sugar or disaccharide.
