The Human species, known also as Terrans or Earthlings, comes from the planet Earth. As the founders of and dominant species in the Terran Empire, they're one of the most powerful species in the Galaxy.
Humans have a fairly common body structure - bipedal, upright posture, two manipulating hands, a head containing the brain and sense organs, and an internal skeleton. In fact, scientists throughout the Galaxy widely use the term "humanoid" to refer to the general body shape of many species.
In Galactic society, Terrans are known for blindingly rapid technological and social change and their ability to adapt to an enormous number of environments and situations. However, many aliens also regard them as capricious, power mongering, and violent. Many species hope the Terran Empire's relatively long period of dominance indicates Humans have finally "settled down" to a more stable social pattern.