Mac OS Lion, also known as OS X Lion, is a major release of Apple's Mac operating system, which was released on July 20, 2011. It was the eighth major release of the Mac OS X series.
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An ISO file, also known as an ISO image, is a type of file that contains the contents of an optical disc, such as a CD or DVD. It is a single file that can be used to create a bootable disc or to install an operating system. Mac OS Lion, also known as OS X