OS X Lion
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OS X Lion, also known as Mac OS X Lion, is the eighth major release of macOS, Apple's desktop and server operating system for Mac computers.
OS X Lion was announced alongside iOS 5 and iCloud at WWDC 2011 at Moscone West.
MacOS
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macOS, originally Mac OS X, previously shortened as OS X, is an operating system developed and marketed by Apple since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and laptop computers, it is the second most widely used desktop OS, after Microsoft Windows and ahead of all Linux distributions, including ChromeOS.
Steve Jobs talks about the transition to Intel processors.
An illustration of Apple's M1 processor
OS X Lion was announced at WWDC 2011 at Moscone West.