Mac OS X, OS X, and macOS version information

macOS (previously Mac OS X and later OS X) is a series of graphical operating systems developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac family of computers. Within the market of desktop, laptop and home computers, and by web usage, it is the second most widely used desktop OS, after Microsoft Windows.
macOS is the second major series of Macintosh operating systems. The first is colloquially called the "classic" Mac OS, which was introduced in 1984, and the final release of which was Mac OS 9 in 1999. The first desktop version, Mac OS X 10.0.After this, Apple then released operating systems by the name of cat family members

Version | Codename | Darwin version | Release date | Most recent version

Mac OS X Public Beta | Kodiak | 1.2.1 | September 13, 2000
Mac OS X 10.0 | Cheetah | 1.3.1 | March 24, 2001 | 10.0.4 (June 22, 2001)
Mac OS X 10.1 | Puma | 1.4.1 / 5 | September 25, 2001 | 10.1.5 (June 6, 2002)
Mac OS X 10.2 | Jaguar | 6 | August 24, 2002 | 10.2.8 (October 3, 2003)
Mac OS X 10.3 | Panther | 7 | October 24, 2003 | 10.3.9 (April 15, 2005)
Mac OS X 10.4 | Tiger | 8 | April 29, 2005 | 10.4.11 (November 14, 2007)
Mac OS X 10.5 | Leopard | 9 | October 26, 2007 | 10.5.8 (August 5, 2009)
Mac OS X 10.6 | Snow Leopard | 10 | August 28, 2009 | 10.6.8 v1.1 (July 25, 2011)
Mac OS X 10.7 | Lion | 11 | July 20, 2011 | 10.7.5 (September 19, 2012)
OS X 10.8 | Mountain Lion | 12 | July 25, 2012 | 10.8.5 (12F45) (October 3, 2013)
OS X 10.9 | Mavericks | 13 | October 22, 2013 | 10.9.5 (13F1112) (September 18, 2014)[170]
OS X 10.10 | Yosemite | 14 | October 16, 2014 | 10.10.5 (14F27) (August 13, 2015)
OS X 10.11 | El Capitan | 15 | September 30, 2015 | 10.11.6 (15G31) (July 18, 2016)
macOS 10.12 | Sierra | 16 | September 20, 2016 | 10.12.6 (16G29) (July 19, 2017)
macOS 10.13 | High Sierra | 17 | September 25, 2017 | 10.13.5 (17F77) (June 1, 2018)
macOS 10.14 | Mojave | 18 | Late 2018