In Minecraft, a flat world is a type of world that is generated with a flat terrain, instead of the usual mountainous or hilly terrain. This can be useful for building large structures or farms, as it provides a large, flat area to work with.
There are two ways to create a flat world in Minecraft: using the world creation settings or using a world generator mod. To create a flat world using the world creation settings, simply select the “Flat” preset when creating a new world. You can then customize the settings of the flat world, such as the number of layers of blocks, the type of blocks used, and the height of the world.