Mac OS X is the world’s most advanced operating system. Built on a rock-solid UNIX foundation and designed to be simple and intuitive, it’s what makes the Mac innovative, highly secure, compatible, and easy to use. Quite simply, there is nothing else like it.
Mac OS X version 10.6 "Snow Leopard" is the seventh major release of Mac OS X, Apple's desktop and server operating system. Apple CEO Steve Jobs announced Snow Leopard at WWDC on June 8, 2008, and it was privately demonstrated to developers by Senior Vice President of Software Engineering, Bertrand Serlet. A first public demonstration was given on WWDC 2009 by Serlet and Phil Schiller, Senior Vice President of Worldwide Marketing.2

This version of Mac OS X focuses on improving performance, efficiency and reducing its overall memory footprint compared to its predecessor Mac OS X v10.5 "Leopard", rather than new end-user features. This is also the first Mac OS release since the introduction of System 7.1.2 that does not support the PowerPC architecture, as Apple now intends to focus on its current line of Intel-based products.2

Snow Leopard shipped on August 28, 2009.3 It was sold for Intel-based Macintosh computers running Leopard at US$29 (£25/€29/￥3300) for the single-user license, or US$49 (£39/€49/￥5600) for up to five computers with the family pack. For a qualifying computer bought after June 8, 2009, the upgrade is priced at US$9.95 (£7.95/€8,95/￥980) (with proof of purchase). This upgrade method is only officially supported for users of Mac OS X v10.5 "Leopard", although the company now concedes that this will also work for Mac OS X v10.4 "Tiger" users.4 The officially supported upgrade path for Tiger users is the Mac Box Set, a single package which includes Snow Leopard as well as iLife '09 and iW
Source(s):
www.en.wikipedia.com
www.apple.com


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