Cellulosic ethanol is a type of biofuel made from the cellulose found in plant materials, such as grasses, wood, and agricultural residues. Unlike traditional ethanol, which is often produced from food crops like corn or sugarcane, cellulosic ethanol uses non-food biomass, making it a more sustainable option. The production process involves breaking down the cellulose into sugars, which are then fermented to create ethanol. This method not only reduces reliance on fossil fuels but also helps in managing waste from agricultural practices, contributing to a more environmentally friendly energy solution.