The stereotypical image of a terrorist is usually a muslim, but terrorists are everywhere. They're people who are willing to act on violent ideas. Racist US cops, bullied kids who shoot up their high school (making bullies indirect causes of "terrorists"). Everyone has their breaking point and some are more naturally inclined to solve their problems with violence, causing death to the innocent. Education, culture and surrounding plays a huge part in this. Terrorists are simply products of their environment.