this is a re-flippin'-diculous question... Sorry, I just assume people should know stuff like this, and it's wrong of me ^_^ not very nicelike. Anyway, the main jist of Animal Crossing is that you travel to a new town to start a new life. There you get a house, which you have to pay off to the local storeowner, everyone's favorite raccoon Tom Nook. You can pay off debts by doing favors for neighbors (NPC animals that say the darndest things), fishing, catching bugs, and digging up fossils (you can also donate these items to the museum and build up the musuem's collection). The random events are commonplace and hilarious. I could give many many examples but that is pretty much the game in a nutshell. You can also design clothing, customize a town tune, garden, make your town and house exactly the way you want them, come up with sayings for neighbors to say.... the list goes on. The fun is just multiplied as you throw this all online

It's cool. Give it a whirl if you get the chance.