The operating system used by Apple Macintosh computers to control all computer functions, from finding files, opening applications, formatting external media, etc. The Macintosh OS was the first popular GUI (graphical user interface) and its ease of use and WYSIWYG display helped create desktop publishing. There are many versions and updates to the operating system, but System 7.5.X is the most recent as of this writing. Apple has recently begun licensing the Macintosh OS to other computer manufacturers, such as PowerComputing and Radius, with the hopes of spawning a wide clone market, as was the case with the IBM-compatible computer.
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