The term “biofuels” encompasses a wide range of fuels, including vegetable oils, animal fats, ethanol, biodiesel (any oil or fat that undergoes
transesterification to more closely resemble mineral-based fuel), and synfuel
(fuel made from gasified organic matter, then liquefied to form fuel). The main
common trait of all these fuels is that they are derived from organic biomass,
rather than minerals.