Enzymes are biological catalysts that carry out reactions faster and more efficiently than normal conditions. They have a specific three-dimensional structure that allows them to catalyze specific reactions. Cellulase enzymes are used in bio-processing of textiles like bio-singeing, bio-polishing, denim washing, and bio-washing. Cellulase breaks the beta-1,4 glycosidic linkages between glucose units in cellulose, removing protruding fibers to make fabrics softer and reduce pilling. The optimum conditions for cellulase activity are a pH range of 4.5-5.5 and temperature of 45-55°C.