Steampunk is a subgenre of speculative fiction, usually set in an anachronistic Victorian or quasi-Victorian alternate
history setting. It could be described by the slogan "What the past would look
like if the future had happened sooner." It includes fiction with science fiction, fantasy or horror themes.
Medieval Steampunk: Speculative fiction set during the Middle Ages.
Victorian Steampunk: A modern Science Fiction
work (post-1930s) that is set in the early parts of the industrial revolution.
Western Steampunk: Science fiction set in the
American Old West.
Industrial/Modern Steampunk: Science fiction taking place in the late industrial age, early modern age; i.e. World War
1, World War 2