Orcs are brutish humanoids, typically only slightly larger than humans but with much more muscle mass.
The foul creatures are so ubiquitous that every farm and village in every corner of the world has heard some tale of the green-skinned marauders sweeping down from the hills or bubbling up out of the deep places of the earth to overrun the land and destroy everything in their path. Every child old enough to pick up a stick and pretend it's a sword has imagined swinging it at an orc and lopping off the imaginary foe's head.