It is a code needed in order to play the game.
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no.
A serial code in The Sims 3 is what you require to install the game which means no serial code is equal to no Sims 3 on your computer.
Yes, you must have a serial code to install the Sims 3.
A serial code for a dsi is on the back of the dsi under the barcode, only you start with tw not whatever is on there like this:TW582054296 Not a real code
Inside your Sims3 CD case, there is suppose to be an booklit that has the same cover as the CD case. Look at the back of that at the bottom. If you don't have the booklit, go back to the store that sold it to you with your purchase-slip, and ask them for the booklit. If for some reason you have a booklit that's black and white on the outside, you might have an coppied CD/CD case/booklit/Game. If you have an booklit, but there is no number at the bottom-back, go ask the store you bought it at for help or look inside the case somewhere, it might be there...