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'''Xenos worlds''' are non-human and non-Imperial worlds inhabited by alien races. Most alien races occupy only a single world or a small group of worlds. The majority of aliens are comparatively primitive, peaceful or powerless, and of little interest to humanity. Only a few alien races are powerful, aggressive and possess technology which rivals that of the Imperium. Of these, the most common are the [[Ork]]s, [[Eldar]], [[Necron]]s and [[Tau]].{{Fn|1}}

[[White Dwarf 139 (UK)]] (page 9) states that '''''"Humanity is but one of many races in the galaxy. However, none are so widely distributed or so numerous as humans."''''' Contradicting this however, several sources (including [[Codex: Orks (2nd Edition)]] page 4) clearly state that the [[Ork]]s are the most widespread race in the galaxy. A possible compromise of these two opposing statements would be that the Orks are the more numerous race but are split into many fragmented factions, whilst the [[Imperium]] is the largest cohesive empire.