Original: Mac OS X Leopard (version 10.5) is the sixth major release of Mac OS X, Appleâ s desktop and server operating system for Macintosh computers.
Simplified: Mac OS X v10 .5 "Leopard" is an operating system made by Apple Inc. for its Macintosh line of computers. It is a version of Mac OS X, and carries the release number 10.5.