Minecraft wiki entry for Buffet, associated text: Buffet world types allow the player to choose a biome that the world uses in generating terrain of Overworld. Biome choice determines things such as terrain, vegetation, generated structures (if applicable), and to some extent, mob spawning. Buffet worlds can be customized to use any one of the available biomes and use only that particular biome for the entire world. The player can choose any of the existing biomes, including technical biomes (such as different End island types).