Warhammer 40,000 (aka Warhammer 40k) is a science fiction universe originally created for the corresponding table-top miniature game but has since had numerous other fictional works set in it.
Warhammer 40,000 (or Warhammer 40k) is a tabletop miniature game produced by Games Workshop, set in a dystopian science fiction universe. It was created in 1987 as a futuristic companion to the popular Warhammer game.
Warhammer 40,000 is set in a vast fictional universe about 38,000 years in the future. It has many different various factions and races represented in the game, with varying strengths and weaknesses. The background and playing rules of each faction are covered in the game's rule books and supplemental army codexes.
The Warhammer 40,000 setting has also been used for other games, including several video games, as well as works of fiction - comics, movies, music, novels and short stories. Questions on this property tends to originate from this spin-offs as questions about the mechanics of the game itself are off-topic.