What Does Tiger Mean?
Tiger was the codename for Apple’s OS X version 10.4, released in April 2005. The original release was Cheetah, version 10.1, with later releases named Puma, Jaguar and Panther (versions 10.2, 10.3 and 10.4, respectively). Tiger was the longest running version of OS 10, succeeded by Leopard in October 2007 (30 months later), which was the first version of OS 10 supplied on a DVD.
Techopedia Explains Tiger
Significant OS enhancements of Tiger over previous versions included: