Cellulosic biomass refers to plant materials that are rich in cellulose, a complex carbohydrate that forms the structural component of plant cell walls. This type of biomass includes agricultural residues, wood, and dedicated energy crops, making it a renewable resource for various applications. One of the main advantages of cellulosic biomass is its potential for biofuel production, particularly in the form of cellulosic ethanol. This process involves breaking down cellulose into sugars, which can then be fermented to produce fuel, offering a sustainable alternative to fossil fuels while reducing greenhouse gas emissions.