Apple Computer, Inc was founded on April 1, 2006, and later became incorporated on January 3, 2007. The company officially became Apple, Inc on January 9th, when Steve Jobs introduced the iPhone, reflecting a shift towards the consumer electronics market. The iPhone was joined by the iPad on January 27, 2010, expanding and solidifying Apple's mobile operating system, otherwise known as iOS.
Apple played a key role in defining the personal computer, introducing the Apple I in 1976 and the Apple II in 1977. Apple would go on to introduce a long line of computers, including the Lisa and Macintosh, various versions of the Mac, most recently the iMac, Mac Pro and Macbook Pro, and Macbook Air. Throughout the history of Apple computers, the company introduced various iterations of the desktop operating system, including Tiger, Leopard, Snow Leopard, Lion, Mountain Lion, Mavericks, and Yosemite.
Apple, Inc is now one of the most successful tech companies in the world, developing hardware and software for desktop computers, mobile devices, watches, and televisions. As a result, Apple is now developing four operating systems, simultaneously: OS X for the Mac, iOS, for the iPhone and iPad, Watch OS for Apple Watch, and, TV OS. The disparate and seemingly separate realms of computing have now become more closely integrated, allowing Apple users to share content and use services seamlessly across platforms. Under Tim Cook's leadership, Apple introduced the Apple Watch in the Spring of 2015, and the Apple TV OS in the fall of 2015, greatly expanding the Apple ecosystem.