Biodiesel is made from vegetable oils, animal fats or recycled greases . Biodiesel is produced from oils or fats using transesterification. This is the most common biofuel in Europe.
Biodiesel is meant to be used in standard diesel engines and is thus distinct from the vegetable and waste oils used to fuel converted diesel engines. Biodiesel can be used alone, or blended with petrodiesel.
For more info see:
1. Wikipedia Article on Biodiesel, http://en.wikipedia.org/wiki/Biodiesel#Biodiesel_feedstocks
