Safari is a web browser developed by Apple Inc. and included in Mac OS X. It was first released as a public beta on January 7, 2003, and is the default browser in Mac OS X v10.3 and later. A beta version for Microsoft Windows was released for the first time on June 11 2007 with support for Windows XP and Windows Vista, although it was also functional, albeit unofficially, on Windows 2000. Safari has also been run unofficially on Linux under Wine, but the graphical user interface (GUI) and web graphics do not render properly.

Since the release of Safari, its browser usage share has been climbing. For the month of May 2006, thecounter.com shows that Safari has a usage share of 2.86%; NetApplications.com reports that Safari has a usage share of 4.59% as of April 2007, and 5.82% as of January 2008.