In simpler times, you handed your friend a controller and played multiplayer games on your couch. Now? It's all about online. To play against real humans on Xbox, you need an Xbox Live Gold subscription. That costs money.
However, in the wake of Click Frenzy and the upcoming Black Friday sales, Microsoft have slashed the price on 3-Month Gold subscriptions - best of all, you can download multiple codes and Microsoft will add them consecutively.