Post-Apocalyptic
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Post-Apocalyptic is a form of Setting Aesthetics that, as its name suggests, takes place in a once-thriving world that was subsequently blown up or otherwise ravaged by massive disasters of some kind or another. It's an extremely popular aesthetic with many different forms, ranging from nuclear war to zombie apocalypse to alien invasion, and has been an amendment to or basis for many different /tg/ related publications.
Many Post-Apocalyptic settings has the cataclysm as its main theme - Mad Max and Fallout are good examples of worlds where the apocalypse is in the forefront - but others are more subtle. Warhammer 40.000 is technically post-apocalyptic, as is Age of Sigmar. Dark Souls is also an example, where the apocalypse is there but it isn't clearly about an apocalypse as much as its about just doing things in a weird world.
D20 Apocalypse is literally a book about doing D20 Modern games set in this genre.