If you don't know what it is, why are you here?
And if you genuinely don't know what it is, this site isn't really the place to teach you about it, nor the basics of game-play. However, you could try looking at:
- www.minecraft.net - official home of the game itself. Buy it, you won't regret it!
- www.minecraftforum.net - news site dedicated to all things Minecraft.
- www.minecraftwiki.net - extensive site detailing how to play the standard game.
And then, once ready to set foot into the wonderful word of online construction and survival, you are welcome on the uRPS server!