OS X OS X
（重定向自MacOSX）
![](/Images/godic/202501/25/OS_X_El_Capitan_screenshot4504.png")
![Simplified history of Unix-like operating systems](/Images/godic/202501/25/Unix_timeline.en.svg4504.png")
![Steve Jobs talks about the transition to Intel processors](/Images/godic/202501/25/Steve_Jobs_Presentation_14504.jpg")
![](/Images/godic/202501/25/Mac_OS_X_Timeline_of_Versions4504.png")
OS X (pronounced /oʊˌɛsˈtɛn/, oh-ess-TEN; originally Mac OS X) is a series of Unix-based graphical interface operating systems (OS) developed and marketed by Apple Inc. It is designed to run on Macintosh computers, having been pre-installed on all Macs since 2002. Within the market of desktop, laptop and home computers, and by web usage, OS X is the second most widely used desktop OS after Windows.