>>95965857
Steampunk is the catch-all name for retrofuturist science fiction specifically themed around and inspired by the period when steam power was relevant, i.e. the 19th century, as well as its aesthetic. As for defining significant works, "The Difference Engine" is commonly cited as one of the foundational works of the genre.

Cogfop is the most surface-level interpretation of the steampunk aesthetic. It's typically characterized by Victorian fashion haphazardly slathered in seemingly nonsensical cogs and gears.