iOS is Apple's mobile operating system originally developed for the iPhone and later used in iPod Touch and iPad devices. It shares a Unix foundation with Mac OS X. iOS has four abstraction layers: Core OS, Core Services, Media, and Cocoa Touch. Apple designs and markets consumer electronics, software, and computers. Their major hardware products include Mac computers, iPod, iPhone, and iPad, and their software includes Mac OS X, iTunes, iLife, iWork, and Logic Studio.