There is a whole ton of information on The Sims 3 website, www.thesims3.com
This is the official website which will tell you all about the game and it's expansions; it also contains a community forum where there is a lot of information.
Essentially, it is a game where you act as the controller of your sims' lives. You can live their life, ie. get a job, buy/build a house, get married, have children.
Pretty much anything you want (within reason) can happen. But I sense you would want more information than that, so I suggest you try the link.
Chat with our AI personalities
you can find some on the sims 3 website or you can go to modthesims2 dot com to find downloads for the sims 2 and 3
there are many ways that sims can die or be killed on the sims 3 wii,here are some reasons:flies,drowning,fire,electrcution,and old age
yes, some come with expansion packs and some you can download for free from the sims 3 exchange. You can even create your own by downloading the create a world tool from the sims 3.com.
Lots are out. The sims 3 university, sims 3 nightlife, sims 3 adventures, sims 3 generations... you name it!
No, you cannot have Sims 2 pets on Sims 3. You must have Sims 3 pets for Sims 3 or Sims 2 pets for Sims 2.