If you need to be told what Halo is, then welcome to the modern world, Lothar. Your cave was warm and inviting, to be sure, but this land has many conveniences, such as video games.
Anyway, Halo 3 is here. Microsoft's nuclear bomb in the next-gen console wars has been three years in development, but the delay has apparently allowed Bungie to create a game that not only features a superb campaign, but which also has a huge and expansive multiplayer feature. GameSpot's Game Guide to Halo 3 is going to focus more on the singleplayer campaign than the multiplayer; if you're looking for online tips, then we recommend you check our forums for the game.
If you want to know more about the campaign, however, here's what we have in store for you.