There are basically three types of hydrocarbons: saturated hydrocarbons, which don't have double, triple or aromatic bonds, [unsaturated hydrocarbons]?, which have one or more double or triple bonds between carbon atoms, and aromatic hydrocarbons, which have at least one [aromatic ring]? in addition to whatever bonds they have.
Unsaturated hydrocarbons are divided to:
Geologically-extracted hydrocarbons are referred to as petroleum (literally "rock oil") and are a significant source of fuel and raw material as a feedstock? for the production of [organic chemicals]?.