A Guide to Subgenres and Terminology in Science Fiction

Steampunk
One of the genres of science fiction, it's a subgenre of alternative history that asks, 'What if the technology of the 18th and 19th centuries had reached the level of the 21st century or beyond?' It utilizes classic mechanical devices like steam engines while having an overall level of technology that's considered 'over-technology,' which is the key point of distinction from cyberpunk. In short, it can be seen as 'a meeting of the past setting and future technology.'
*Works: Fallout 3, Howl's Moving Castle, Netflix Love, Death + Robot (EP 8 Good Hunting)

Dieselpunk
A genre that started with the idea of, 'What if we explored a setting closer to the present than the Steampunk world?' It reflects everything from the 1920s to the 1950s, the golden age of America.
*Works: BioShock, Machinarium

Atompunk
Set around the 1940s-60s in America.

Cyberpunk
Primarily a science fiction genre that deals with the near future.
*Works: Cyberpunk 2077, Ghost in the Shell, Gattaca (Genetic Superiority), Equals (Emotionally Equal), Minority Report (Crime Prediction Technology), Equilibrium (Emotion Control), The Matrix (Virtual Reality), Blade Runner, Alien, Cloverfield 10 (Thriller), Last Days on Mars (Mars Zombie), The Martian, Gravity *Other subgenres include Nanopunk (nanotechnology), Biopunk (biology), Ribopunk/Ribofunk (a subgenre of cyberpunk that uses ribosomes and, more broadly, genetic engineering symbolized by the Genome Project and cloning as its themes), Time Travel (Time Slip stories/ movies like The Curious Case of Benjamin Button, Eleven)

Slipstream
Compatibility between science fiction and fantasy genres. Science fiction works written by non-SF writers.
*Key Authors: Lucius Shepard, Connie Willis, Walter Jon Williams, Ray Bradbury, Ursula K. Le Guin, Kurt Vonnegut.

Individualistic Science Fiction
A single protagonist, a closed space, a situation already immersed in a science fiction environment.
*Works: First Man (Documentary), Triangle (Afterlife - Self-Division - Trapped in Memory), Edge of Tomorrow (Returning to Before Death), ARQ, Discovery (Resurrection of Post-Human), Eternal Sunshine of the Spotless Mind (Memory Erasure of a Former Lover)

Post-Apocalypse
After the destruction. A subgenre of science fiction that deals with the theme of the end of the world. The genre depicts the destruction of civilization and humanity through large-scale wars, natural disasters, pandemics, or supernatural events, or the world after civilization has been destroyed.
*Works: Fallout, PlayerUnknown's Battlegrounds, Train to Busan, The Mist, The Walking Dead, I Am Legend, The Blind Side

Space Opera
Adventure and epic-style science fiction novels set in space. It can be translated as 'space drama' in Korean. In fact, the name itself is a derogatory term, meaning 'space + drama' (Space + Soap Opera). However, this genre later saw a reversal of image, with the release of a novel titled 《Space Opera》 and titles like 《Star Wars》 and 《Star Trek》.
*Works: Doctor Who, Marvel Comics. Guardians of the Galaxy, Star Trek, Avatar