Biodiesel is a type of fuel made from vegetable oil or animal fat that can be used to power diesel engines. There are several synonyms to describe biodiesel, including biofuel, renewable diesel, and green diesel. Biofuel refers to any fuel that is derived from organic matter, including biodiesel, ethanol, and other types of biofuels. Renewable diesel is a term used to describe diesel fuels made from non-fossil sources, such as animal fat or plant oil, rather than petroleum. Green diesel is a biofuel made using a refining process that converts fats, oils, and greases into a diesel-like fuel. These synonyms all describe fuels that are more environmentally sustainable than traditional fossil fuels.