Orcs are a fairly common goblinoid race.

Your basic everyday Orc is an ugly bully, somewhat tougher than your average human. They tend to serve as commanders in goblin-kin armies, as they're big enough to push Goblins around.

An Orog is half Orc and half Ogre. They tend to be even more militant than regular Orcs.

Half-Orcs are a combination of Orc and some other race. As such, the Half-Orc template may be combined with other racial templates. If you desire to do so, you'll need to work closely with your GM to produce an acceptable half-breed template.