Wild Space was the frontier of galactic society, separating the known parts of the galaxy from the Unknown Regions of the western half of the galactic disk, as well as the fringes of the Outer Rim Territories and the arms of the galaxy. The term had varied greatly over the years, encompassing all areas of partially explored or charted areas as known throughout various stages of galactic history.
The term "Wild Space" was first used in the Great Manifest Period when discussing the area of partially explored space to the "east" of the galactic core. This area, as it became settled, eventually became known as "the Slice." Over the years, different definitions of Wild Space evolved, dependent upon what was known or unknown to the broader galactic community at the time.
One of Palpatine's last acts was to open up much of the region to more extensive exploration. Wild Space differed from the Unknown Regions in that most of Wild Space had been charted, with established hyperspace routes, and that it was considered part of the wider galactic community despite not being fully explored, whereas the Unknown Regions remained almost entirely uncharted and unexplored both, and were deemed separate from the rest of the galaxy proper.