Mac OS X Leopard (version 10.5) is the sixth major release of Mac OS X, Apple's desktop and server operating system for Macintosh computers. Leopard is the final version of Mac OS X to support the PowerPC architecture as Snow Leopard functions solely on Intel based Macs. According to Apple, Leopard contains over 300 changes and enhancements over its predecessor, Mac OS X Tiger, covering core operating system components as well as included applications and developer tools. Leopard introduces a significantly revised desktop, with a redesigned Dock, Stacks, a semitransparent menu bar, and an updated Finder that incorporates the Cover Flow visual navigation interface first seen in iTunes. Other notable features include support for writing 64-bit graphical user interface applications, an automated backup utility called Time Machine, support for Spotlight searches across multiple machines, and the inclusion of Front Row and Photo Booth, which were previously included with only some Mac models.