The term Steampunk is seen to be a sub genre of alternate history, fantasy and science fiction. The popularity of this genre came about between the late 1980’s and early 1990’s.
“In three short words, steampunk is Victorian science fiction. Here “Victorian” is not meant to indicate a specific culture, but rather references a time period and an aesthetic: the industrialized 19th century. Historically, this period saw the development of many key aspects of the modern world (mechanized manufacturing, extensive urbanization, telecommunications, office life and mass-transit), and steampunk uses this existing technology and structure to imagine an even more advanced 19th century, often complete with Victorian-inspired wonders like steam-powered aircraft and mechanical computers.”