Mac OS is an operating system like Windows and Linux on Mac computers that began in January 24, 1984 by Apple, although more expensive than the regular Microsoft Windows. Today, Apple's Mac is still more expensive than Microsoft Windows.
The current version is Mac OS X High Sierra 10.13.
The Macintosh OS originated on the first Apple Computer, the Apple Macintosh. It preforms the same functions as Windows but doesn't has a library as vast as Windows and is therefore best suited for business and school use. It doesn't have many games for its platform but is desired for certain programs like Garage Band , some editing software , and making movies. The Macintosh was named after Steve Jobs' favorite type of Apple, the McIntosh Apple.
Mac OS has a tool called Boot Camp Assistant that allows you to install Windows on a Mac OS, this is due to how Apple originally designed the Personal Computer on MS-DOS, which in the final versions of Macintosh, was changed entirely, making it a standalone Personal Computer.
Only a few pieces of malware that targets the Mac OS, as it has a low market share.