Without taking retroactive classifications into account, the cyberpunk genre is unarguably where it all all started. Cyberpunk combines a dystopian near-future setting with a heavy emphasis on emerging technologies; in the 1980s this meant things like the internet, virtual reality, and practical body modification. Cyberpunk became a prominent subgenre after William Gibson helped to define it in his groundbreaking 1984 novel Neuromancer.
Just for fun, here are a range of other subgenres that have developed in the years since, each of which use the -punk suffix as a marker to let audiences know they are engaging with a fictional world. The various subgenres explore potential futures through highly specialised aesthetics - some of them are superficial in outlook, emphasising style over narrative, whereas others hone in on particular themes and concerns.
Steampunk: The most popular of the -punk subgenres (after the 80s/90s computer tech of cyberpunk) is the Victorian-era aesthetic of steampunk, which is perhaps as much about cosplay and fandom as it is about colonial-flavoured alternative realities. Think Jules Verne, The Golden Compass, some Studio Ghibli films.
Dieselpunk: Most of the -punk subgenres are heavily fixated on a particular aesthetic and its through this that the genre is defined. In this sense, dieselpunk presents alternative realities built from combustible engines and 1930s tech. See: Indiana Jones, The Rocketeer, the comic series Hellboy, the first Captain America film.
Clockpunk: Clockpunk is a subgenre that draws on Renaissance designs and iconography to present an alternative sci-fi realm that images a post-medieval world of light and strength. Think Da Vinci, conquistadors, 15th century Europe.
Rococopunk: This seems to be more stylistic than an actual genre of storytelling. It relates to a combination of cyberpunk and rococo/baroque fashion. One of the best things about the -punk suffix is that the suffix itself has the power to inspire bold new combinations of history and storytelling, with fandoms branching out to create their own costumes from the most flowery recesses of their imagination. When I hear 'Rococopunk' I mostly think of music videos like The Killers 'Mr Brightside' or Adam and the Ants.
Atompunk: When 1950s atomic-age aesthetics are used to present an alternative future with a decidedly retro look. Sometimes called 'Raygun Gothic', used to describe everything from The Jetsons to the original series of Star Trek or the film Sky Captain and the World of Tomorrow.
Biopunk: Biopunk is a sci-fi subgenre that focuses on biotechnology and synthesised biology. Think David Cronenberg's films eXistenZ or Crimes of the Future, the animal-splicing of Island of Dr Moreau, H.R. Giger's monster designs. A genre that explores the blurring of lines between technology and nature, and the disturbing consequences that might ensue.
Solarpunk: An aesthetic built on a hypothetical utopian future scenario in which climate, environmental, and sustainability issues have been solved. It functions as both a subgenre of sci-fi and art, and can also be observed in the more speculative flourishes of architecture and town planning.
Formicapunk: This is a recent branch that demonstrates the way that the -punk genre tree will always continue to grow and revisit territory in new ways. Formicapunk leans heavily on retro-futurism and the stylistic flourishes of the 80s. Also known as casettepunk. You already know this look and love it.
Lunarpunk: A less-developed idea but one in which scenarios have been put forth where sustainable technology is combined with Wicca, supernatural, and pagan-esque iconography.
Decopunk: Calling upon the aesthetics of the Art Deco movement, this subgenre combines 1920s architecture with sci-fu futurism... hello Metropolis! Aside from the superficial elements that contribute to a particular look, this subgenre also alludes to fascism and Italian futurism.
Feudalpunk: A personal favourite. Feudalpunk combines sci-fi tropes with medieval settings and scenarios in order to explore the intersection of society, control of knowledge, and the devastation of technologies beyond our understanding. It's not a popular subgenre but it certainly exists, see: A Canticle for Leibowitz, Gene Wolfe's novels, the original plans for Alien 3, Riddley Walker, and Dune.
Steelpunk: The uglier, updated, more industrial son of dieselpunk. Rivets, hardware, and pollution abound in this grimy post-apocalyptic permutation. Common in '90s and '00s visions of the future - see films like The Terminator, Mad Max, Robocop, The Edge of Tomorrow.
Silkpunk: A steampunk alternative that draws on Asian antiquity rather than the Victorian era. First identified by Chinese-American writer Ken Liu, this subgenre has been a point of contention in relation to accusations of cultural appropriation - with some Asian writers asserting that its co-opting by Western authors serves as a creative intellectual cousin to colonialism or exploitation.
Elfpunk: Elfpunk transports fae and elven characters into a gritty urban setting - exploring a juxtaposition of the faerie realm with motorcycles, rock bands, and nightclubs.
Sandalpunk: This one combines technology and speculative worlds with alternative versions of ancient European and Middle Eastern civilisations. Examples include Stargate, various depictions of Atlantis, and 300.
Stonepunk: Stonepunk does the same thing as other -punk subgenres but with dinosaurs and/or a prehistoric setting. The Flintstones didn't set out to slot into this genre (it hadn't been invented yet) but it retroactively fits the bill! Perhaps more of a fantasy derivative than sci-fi.
Cattlepunk: This is the territory where sci-fi meets the Western - cyborg cowboys, robot horses, and super-powered railways abound. This genre perhaps exist mostly as an excuse to keep the tropes of the Western genre alive into the 21st century. Examples include Cowboys and Aliens, the comic East of West, the Will Smith movie Wild Wild West, Westworld, and the TV series Firefly.
And, as far as I know, that's pretty much it for the moment. There are others that don't feel as developed or don't seem differentiated enough from other genres (nanopunk, hopepunk, capepunk, oceanpunk, nowpunk, mythpunk) so I've left these out. Perhaps one day we'll see an Indigenous Australian approach that things like Cleverman could retroactively fit into (ochre-punk?) If you know any other -punk genres that I haven't mentioned, please let me know!
Disclaimer: This is an expanded version of a Twitter thread I wrote five months ago. Most of the images were sourced through Pinterest, where such things are shared and shared again in an endless recursive loop. If you are the artist of any of these pictures and would like credit or for the image to be removed, just let me know and I'll do that.