A cellulose sponge is made of cellulose, a natural polymer that is found in the cell walls of plants. Cellulose is a long, chain-like molecule that is composed of glucose molecules. When cellulose is processed, it can be turned into a variety of products, including paper, cardboard, and textiles. Cellulose sponges are made by treating cellulose fibers with a chemical solution that causes them to swell and form a porous structure. This structure allows the sponge to absorb and hold water. Cellulose sponges are biodegradable and compostable, making them an environmentally friendly alternative to synthetic sponges.