Biofuels are renewableRenewable is a term used widely in the energy sector. It essentially refers to something that can be fuels derived from biological materials such as plants or animal waste. Biofuels are categorised in different ways by various governing and regulatory bodies that dictate renewableRenewable is a term used widely in the energy sector. It essentially refers to something that can be fuel standards. Generally, biofuels can broadly be classed as either conventional or advanced biofuels based on the materials used to make them. Conventional biofuels include bioethanol, biodiesel, and biogases. These are all made from feedstockFeedstocks are the raw materials used in a manufacturing process to produce a final product. The typ materials. Advanced Biofuels are a type of biofuel produced for biological materials that come from non-food sources or waste. For example, algal biofuels are generally classified as a form of advanced biodiesel as they are not produced from feedstockFeedstocks are the raw materials used in a manufacturing process to produce a final product. The typ. These fuels have a lower environmental impact in terms of issues like land-use. Cellulosic ethanol also falls into this category as the ethanol is produced from the fermentation of non-food plant matter, such as wood.