Global vehicle population has undergone profound growth over the past few decades. This upsurge in vehicle population has payed the foundation for several economical and environmental concerns. These predicaments have in turn compelled governments to impose regulations on emission levels and seek alternative fuel options. This led to the efforts to commercialize alternative fuels on a mass scale, though they have been in use since long. Today, charging up the demand for alternative fuels is the increasing concern for the environment, public health, national self-dependence for energy needs, and the non-sustainability of fossil fuels. Alternative fuel, also known as non-conventional fuels, is any material or substance that can be used as a fuel, other than fossil fuels, or conventional fuels like petroleum (oil), coal, propane, hydrogen, and natural gas. The term "alternative fuels" usually refers to a source of which energy is renewable. Some well known alternative fuels include biodiesel, bioalcohol (methanol, ethanol, and butanol), chemically stored electricity (batteries and fuel cells), hydrogen, non-fossil methane, natural gas, vegetable oil and other biomass sources. You probably know that plant oil byproducts are nutritious and healthy. But did you know they can power a car? Find out how plant oils, as well as animal fats, are used to create the environmentally friendly fuel -- biodiesel. Now let us discuss how BIODIESEL works as alternative fuel.!