It is a graphical user base interface operating system developed by Apple.It is a secured operating system.It will always be free from viruses and other threats.But because of the the high protection the os will only support apple softwares and products.The original form of what Apple would later name the "Mac OS" was the integral and unnamed system software(os) first introduced in 1984 with the original Macintosh, usually referred to simply as the System software.
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