System version: MAC OS bigsur11.0.1.
Apple notebook system is MacOS system.
Mac OS (MAC OS X 2011+0 and before, OSX 20 12 to 20 15) is an operating system based on graphical user interface, and it is the main operating system of Macintosh series computers.
MacOS consists of two main parts: the core is called Darwin, which is based on BSD source code and Mach microkernel, and is jointly developed by Apple and the independent developer community; And the patented graphical user interface named Aqua developed by Apple.
MacOS is the world's first comprehensive operating system based on FreeBSD system and adopting "object-oriented operating system".
The object-oriented operating system was developed by NeXT, which was founded after Steve Jobs was forced to leave Apple in 1985. Later, Apple acquired NeXT. Jobs became the CEO of Apple again, and the Mac OS system that Mac started to use was integrated into the Openstep system developed by NeXT.
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