The primary role of the cellulase enzyme is to break down cellulose, a complex carbohydrate found in the cell walls of plants. Cellulase hydrolyzes the β-1,4-glycosidic bonds in cellulose, converting it into simpler sugars like glucose. This enzyme is crucial for organisms that digest plant material, including many fungi and certain bacteria, enabling them to access energy from plant polysaccharides. In industrial applications, cellulase is used in processes like biofuel production, textile manufacturing, and food processing, showcasing its economic importance.