Apple released the first version of Mac OS X (v10.0 "Cheetah") in March 2001 proclaiming it as "the world's most advanced operating system".
Subsequent releases in Sept 2001 (v10.1 "Puma"), August 2002 (v10.2 "Jaguar"), October 2003 (v10.3 "Panther"), April 2005 (v10.4 "Tiger"), October 2007 (v10.5 "Leopard") & August 2009 (v10.6 "Snow Leopard") have seen the OS mature and enhanced with additional features & capabilities.
This section provides up-to-date Mac OS X information.