Because it allows people to play in the exact same world from different computers, and maybe share something they find with others that is naturally generated.
there is no seed for planetoids you have to get an external world generator to make it
A world generator allows you to generate random seeds but if you try generating that seed again it will still be the same seed.
World seed-404
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.
An underwater world seed for Minecraft is used to open an underwater world to play the game in.
It is not a seed, it is a world download. Look up dropper world download on google or minecraft forums
1. Singleplayer 2. Create new world 3. Name it 4. It will say map generator. Put what ever you want in there.
If cheats are enabled in your world, do /seed to find your seed.
kaien's world
-3085574207588475592
Well there is one way to get into good worlds in Minecraft. Type in a seed.
sand cave