• A series of proprietary graphical operating systems developed and marketed by Apple since 2001. macOS is the primary operating system for Apple’s Mac computers. Within the market of desktop, laptop, and home computers, and by web usage, it is the second most widely used desktop operating system after Windows. macOS is the second major series of Macintosh operating systems. The first is colloquially called the classic Mac OS, which was introduced in 1984, and the final release of which was Mac OS 9 in 1999. The first desktop version, Mac OS X 10.0, was released in March 2001, with its first update, 10.1, arriving later that year. macOS is based on Unix. ← Wikipedia ↑ apple.com/macos

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