This project focuses on biodiesel derived from oilseed crops.  The following statement is taken from Wikipedia with associated links.   

Biodiesel is a non-petroleum-based diesel fuel consisting of short chain alkyl (methyl or ethyl) esters, made by transesterification of vegetable oil, which can be used (alone, or blended with conventional petrodiesel) in unmodified diesel-engine vehicles.

For similar information in a different format see:
- Fatty acid composition of biodiesel
- Overview of oil extraction and biodiesel processing