Humans have always played a prominent part in the development of the galaxy and in galactic politics, not least because of the Empire's hatred of non-human races. Though there are many planets in the galaxy which are generally populated only by Humans, such as the Corellians and the Alderaanians, there are no biological differences between them. They can be found anywhere, engaged in many different pursuits: Mercenaries, pilots, smugglers, merchants, Imperial recruits, assassins, farmers, crime lords, labourers and many others.
Humans are also naturally attuned to the Force, turning out more Force sensitive and Force users than any other species, with the possible exception of the Gand. Many famous Jedi, both of the Old Republic and under the Empire and the Alliance, were Human.