Many families share one computer and in turn, may back up and sync more than one iPhone, iPad, or iPod touch with that one computer. If everyone in your household all shares the same Apple ID for purchases in iTunes, it's normally not an issue. But what if that's not the case and you all want your own Apple ID's for iTunes purchases and you don't want mom's cooking apps mixed in with dad's finance apps? As it happens, you can set iTunes up to separate Apple ID's quite easily.
It'll take a little bit of effort to set up but once you're done, none of your apps, music, tv shows, and movies will be intertwined nor require you to authorize all accounts in the same iTunes library. Here's how.