It means the software "engine" that actually dictates how much land, water, mountains, caves, villages, etc, that a world needs.
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kaien's world
Well, if you mean codes for seeds they are codes that when generating a new world you type in the code for the seed generator and you can choose what kind of world you have. for example the seed worstworldever being typed in to the seed generator would generate a not random world if the password is actually a real seed. You can google seeds and find some that you may like to use.
The Superflat generator does not spawn ores. It's intended for building on in Creative mode.
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No it doesn't. I have it, and it no longer works.