Minecraft

The Overworld and the Nether are the two primary dimensions in Minecraft, each functioning as a separate world with distinct rules, resources, and geography.

The Overworld is the starting dimension where players first spawn. It is modeled after Earth, featuring a wide variety of biomes like forests, deserts, and mountains, as well as a natural day-night cycle.

The Nether is a hostile, volcanic dimension often described as the "underworld" or "hell". It is a cavernous world with no sky, located far beneath or in a separate reality from the Overworld.