The End is a barren, empty dimensional plane containing a large floating island of a unique material called End Stone, dotted with Obsidian pillars. This dimension is populated by a vast number of [[enderman|Endermen]], who spawn considerably more often than in the Overworld, and one [[Ender Dragon]], an End-exclusive mob. 

(Taken from "the Minecraft wiki":http://www.minecraftwiki.net/wiki/The_End) 
the end (minecraft)