Overview
Warhammer 40,000 is a British miniature wargame produced by Games Workshop. It is the most popular miniature wargame in the world, and is particularly popular in the United Kingdom. The first edition of the rulebook was published in September 1987, and the tenth and current edition was released in June 2023.
Description
Warhammer 40,000 is set in the distant future, where a stagnant human civilisation is beset by hostile aliens and supernatural creatures. The models in the game are a mixture of humans, aliens, and supernatural monsters wielding futuristic weaponry and supernatural powers. The fictional setting of the game has been developed through a large body of novels published by Black Library (Games Workshop's publishing division). Warhammer 40,000 was initially conceived as a scifi counterpart to Warhammer Fantasy Battle, a medieval fantasy wargame also produced by Games Workshop.
Warhammer Fantasy shares some themes and characters with Warhammer 40,000 but the two settings are independent of each other. The game has received widespread praise for the tone and depth of its setting, and is considered the foundational work of the grimdark genre of speculative fiction, the word grimdark itself derived from the series' tagline: "In the grim darkness of the far future, there is only war".
Additional Links
warhammer40000.com 
https://warhammer40000.com/ - Official website