Snow Leopard, also known as Mac OS X Snow Leopard, is the current release version of Apple's Mac OS X operating system.  Mac OS X is the operating system that runs on Apple's Macintosh computers.  Snow Leopard was released on August 28, 2009 twenty-two months after the release of Mac OS X Leopard (version 10.5), the prior generation of the operating system.  Snow Leopard has been designated a version number of 10.6 and is the seventh iteration of the Mac OS X operating system.