http://www.minecraftwiki.net/wiki/Minecraft

http://www.minecraftwiki.net/wiki/Minecraft_Wiki

It allows the player to control an avatar that can destroy or create 1 m³ sized blocks on a dynamically expanding map, and interact with the other parts of the Minecraft environment.

This environment which, in addition to blocks, includes plants, mobs, and items. Some activities in the game include mining for ore, fighting hostile mobs as well as creating blocks and tools by gathering various resources found in the game. 

The openness of the game model allows players to create structures, creations and artwork on various multiplayer servers or their own single player maps. 

Other features include redstone circuits for logic computations and remote actions, minecarts and tracks, and a mysterious underworld called the "Nether".