Leopard is another name for Mac OS X 10.5, which was released on October 26, 2007. It was developed after Mac OS X 10.4 Tiger and after that Mac OS X 10.6 Snow Leopard was released.
Mac OS X Leopard was a very large and popular significant update for Mac OS X, with around 300 new features added. These included some very notable additions, including Time Machine (an automated backup solution), Spaces ( a virtual desktop environment ), and Quick Look (a feature that allows to view multiple file types. Through the direct Finder, for which only the space bar has to be pressed.
Leopard was also the first version of Mac OS X that would be included in Boot Camp, a feature that allows you to run Windows on your Mac.
Apart from all these features, Leopard offers many enhancements to the existing Mac OS X software. For example, RSS feed support was added to Mail, advanced photo filters were added to Photo Booth, and Spotlight search feature was added which supports boolean operators. Leopard shipped with Safari 3, the third major release of Apple’s web browser.
The final Leopard software update was 10.5.8, which was released on August 5, 2009.