In universe of Warhammer 40,000, the Dark Eldar are a Kindred of the Eldar, an ancient and advanced race of elf-like humanoids. Their armies usually have the advantages of speed and technology, though they are often lacking in resilience and numbers.
The Dark Eldar revel in piracy, enslavement and torture, and are sadistic in the extreme. Dark Eldar armies make use of various anti-gravity skimmers such as Raiders and Ravagers to launch high speed attacks. They strike with little or no warning, using an interdimensional labyrinth known as the Webway to traverse the galaxy safely and far more quickly than most races are able to with their Warp jumps.
The Dark Eldar are unique amongst the Warhammer 40,000 factions in the sense that they do not occupy many planets, but rather one dark city - Commoragh. They are mainly pirates, though are sometimes used as mercenaries.