Board Thread:Mods, Texture Packs, Skins, and Maps/@comment-50.4.192.80-20130522210829

I keep hearing all this biz about the Nether, and there are creatures and blocks that come from the Nether. But what I"m wondering is: What exactly is the Nether?  Is the Nether a seed or something?  If it is a seed, then how do I get it?  Also need to know in detail how to make flint. 