This information is useful to know when you want to use some software to make sure that it is compatible with your version of Mac OS X.
- Click on the Apple menu in the top left corner.
- Click on About this mac.
- The version appears right under the Mac OS X apple.
List of Mac OS X versions
Mac OS X 10.0 Cheetah - 2001
Mac OS X 10.1 Puma - 2001
Mac OS X 10.2 Jaguar - 2002
Mac OS X 10.3 Panther - 2003
Mac OS X 10.4 Tiger - 2005
Mac OS X 10.5 Leopard - 2007
Mac OS X 10.6 Snow Leopard - 2009
Mac OS X 10.7 Lion - 2011