Biofuels are combustible fuels created from biomass. These biofuels are created from recently living plant matter as opposed to ancient plant matter in hydrocarbons. Biofuels reference liquid fuels such as ethanol and biodiesel that are used as replacements for transportation fuels like petroleum, diesel and jet fuel. Biofuels can also include solid fuels like wood pellets and biogas or syngas. IN liquid fuels there are two main types of biofuels like ethanol and biodiesel. The simplest way to distinguish between the two is to remember ethanol is an alcohol and biodiesel is oil. Ethanol is an alcohol formed by fermentation and can be used as gasoline whereas biodiesel is produced by extracting naturally occurring oils from plants and seeds. This session discusses more about biofuels.