MacOS
Introduction
According to Wikipedia, the free encyclopedia:
macOS (/ˌmækoʊˈɛs/; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and laptop computers it is the second most widely used desktop OS, after Microsoft Windows and ahead of ChromeOS.