OS X (pronounced ; originally Mac OS X) is a series of Unix-based graphical interface operating systems developed and marketed by Apple Inc. It is designed to run on Mac computers, having been pre-installed on all Macs since 2002. It was the successor to Mac OS 9, released in 1999, the final release of the “classic” Mac OS, which had been Apple’s primary operating system since 1984. The first version released was Mac OS X Server 1.0 in 1999, and a desktop version, Mac OS X v10.0 “Cheetah” followed on March 24, 2001. Previous releases of OS X were named after big cats; for example, OS X v10.8 was referred to as “Mountain Lion”. However, with the announcement of OS X Mavericks in June 2013, this was dropped in favor of Californian landmarks. Within the market of desktop, laptop and home computers, and by web usage, OS X is the second most widely used OS after Windows. OS X, whose X is the Roman numeral for 10 and is a prominent part of its brand identity, is built on technologies developed at NeXT between the second half of the 1980s and Apple’s purchase of the company in late 1996. The ‘X’ is also used to emphasize the relatedness between OS X and UNIX. Versions 10.5 “Leopard” running on Intel processors, 10.6 “Snow Leopard”, 10.7 “Lion”, 10.8 “Mountain Lion”, 10.9 “Mavericks”, and 10.10 “Yosemite” have obtained UNIX 03 certification. iOS, which runs on the iPhone, iPod Touch, iPad, and the 2nd and 3rd generation Apple TV, shares the Darwin core and many frameworks with OS X. An unnamed variant of v10.4 powered the first generation Apple TV. Early versions of Mac OS X were compiled to run on the PowerPC CPUs used by Macs of the period. After Apple announced it would shift to using Intel x86 CPUs from 2006 onwards, Tiger and Leopard were released in versions for Intel and PowerPC processors. Snow Leopard was the first version released only for Intel Macs. Since the release of Mac OS X 10.7 “Lion”, OS X has dropped support for 32-bit Intel processors as well. It now runs exclusively on 64-bit Intel CPUs. Apple offers an application for OS X called OS X Server, for use on servers. It includes tools to facilitate management of workgroups of OS X machines, and to provide network services. It is sold separately through the Mac App Store as a single application; it remained sold up to 2014 preinstalled on dedicated server computers. Before the release of Mac OS X 10.7 “Lion”, a separate edition of Mac OS X, called Mac OS X Server, with additional tools bundled with the operating system was sold and was preinstalled on servers. The latest version of OS X is 10.10 Yosemite, which was released to the public on October 16, 2014.