I was reading this article: A rapeseed vegetable oil, pure and blended with conventional FCC feedstock, has been catalytically cracked with a commercial equilibrium catalyst under realistic FCC conditions.

What does this mean? What is Cracking?

Cracking (chemistry) - Definition (http://www.wordiq.com/definition/Cracking_%28chemistry%29)

In a craking operation long chain hydrocarbons are split into smaller pieces that are more suitable for their desired uses. For example, a 20 carbon alkane can be cracked into two 10 carbon fragments.
FCC stands for "FLUIDIZED BED CATALYTIC CRACKER" The alternative to catalytic cracking is THERMAL cracking where the fragmentation is caused by heat alone.
In your article, rapeseed oil (canola oil) with 18 carbon atoms would be fractured to smaller molecules; maybe to make a bio-gasoline(?)