Man: A Course of Study. A controversial education programme in the 1970s.
"After upgrading from Windows, I decided to install macOS on my new MacBook Pro to experience the smooth interface designed exclusively for Apple devices."
A major operating system, formerly known as OS X (and before that as Mac OS X), used on laptop and desktop computers by Apple, Inc.
The name macOS is a combination of Apple's Macintosh computer and the word operating system. It was created to clearly identify the software that runs on these machines while keeping the familiar "Mac" brand recognizable.