Biodiesel is a renewable, clean-burning diesel fuel that is made from vegetable oils, animal fats, or recycled restaurant grease. It is an alternative to petroleum-based diesel fuel and can be used in any diesel engine with few modifications. Biodiesel is a non-toxic, biodegradable fuel that is safe to handle and store. It produces fewer emissions than petroleum-based diesel, reducing air pollution. Biodiesel has also been shown to increase engine lubricity, which can reduce wear and tear on engines.