Operating System (Macintosh)

OSX or Operating System For iMac, iBook and Macbook

OSX is a operating system for Macintosh computers, such as Windows.

OS X or Mac OS X, is a series of Unix-based graphical interface operating systems developed, marketed, and sold by Apple Inc. It is designed to run exclusively on Mac computers, having been pre-loaded on all Macs since 2002. It was the successor to Mac OS 9, released in 1999, the final release of the "classic" Mac OS, which had been Apple's primary operating system since 1984. The first version released was Mac OS X Server 1.0 in 1999, and a desktop version, Mac OS X v10.0 "Cheetah" followed on March 24, 2001. Releases of OS X are named after big cats: for example, OS X v10.8 is referred to as "Mountain Lion".

OS X is the tenth major version of Apple's operating system for Macintosh computers.

OS X's core is a POSIX compliant operating system (OS) built on top of the XNU kernel, with standard Unix facilities available from thecommand line interface. Apple has released this family of software as a free and open source operating system named Darwin. On top of Darwin, Apple layered a number of components, including the Aqua interface and the Finder, to complete the GUI-based operating system which is OS X.

OS X introduced a number of new capabilities to provide a more stable and reliable platform than its predecessor, Mac OS 9. For example, pre-emptive multitasking and memory protection improved the system's ability to run multiple applications simultaneously without them interrupting or corrupting each other. Many aspects of OS X's architecture are derived from OPENSTEP, which was designed to be portable, to ease the transition from one platform to another. For example, NeXTSTEP was ported from the original 68k-based NeXT workstations to x86 and other architectures before NeXT was purchased by Apple, and OPENSTEP was later ported to the PowerPC architecture as part of the Rhapsody project.

OS Windows use *.exe and OSX use *.dmg,*.pkg and *.mpkg

List of OSX :

Mac OS X Version Information

Version	Codename	Date Announced	Release Date	Most Recent Version
Rhapsody Developer Release	Grail1Z4 / Titan1U		August 31, 1997	DR2 (May 14, 1998)
Mac OS X Server 1.0	Hera		March 16, 1999	1.2v3 (October 27, 2000)
Mac OS X Developer Preview			March 16, 1999	DP4 (April 5, 2000)
Public Beta	Kodiak		September 13, 2000
Mac OS X 10.0	Cheetah		March 24, 2001	10.0.4 (June 22, 2001)
Mac OS X 10.1	Puma	July 18, 2001	September 25, 2001	10.1.5 (June 6, 2002)
Mac OS X 10.2	Jaguar	May 6, 2002	August 24, 2002	10.2.8 (October 3, 2003)
Mac OS X 10.3	Panther	June 23, 2003	October 24, 2003	10.3.9 (April 15, 2005)
Mac OS X 10.4	Tiger	May 4, 2004	April 29, 2005	10.4.11 (November 14, 2007)
Mac OS X 10.5	Leopard	June 26, 2006	October 26, 2007	10.5.8 (August 5, 2009)
Mac OS X 10.6	Snow Leopard	June 9, 2008	August 28, 2009	10.6.8 v1.1 (July 25, 2011)
Mac OS X 10.7	Lion	October 20, 2010	July 20, 2011	10.7.5 (September 19, 2012)
OS X 10.8	Mountain Lion	February 16, 2012	July 25, 2012	10.8.2 (September 19, 2012)

Source : Wikipedia