As Apple celebrates its 50th anniversary, the company that's defined consumer electronics since introducing the iPod, and that forever changed user behavior in creating the iPhone, faces a host of critical questions about where it goes from here. Apple first became the world's most valuable company in 2011, passing Exxon Mobil , and held that title for large chunks of the decade plus that followed, occasionally getting surpassed by Alphabet or Microsoft . Apple is now second behind Nvidia ,