The history of macOS, Apple's current Mac operating system formerly named Mac OS X until 2011 and then OS X until 2016, began with the company's project to replace its "classic" Mac OS.

macOS Monterey (version 12) is the eighteenth major release of macOS, Apple's desktop operating system for Macintosh computers.

macOS Ventura (version 13) is the nineteenth major release of macOS, Apple's operating system for Macintosh computers.

macOS Big Sur (version 11) is the seventeenth major release of macOS, Apple's operating system for Macintosh computers.

macOS Catalina (version 10.15) is the sixteenth major release of macOS, Apple Inc.'s desktop operating system for Macintosh computers.

macOS Mojave (version 10.14) is the fifteenth major release of macOS, Apple Inc.'s desktop operating system for Macintosh computers.

macOS High Sierra (version 10.13) is the fourteenth major release of macOS, Apple Inc.'s desktop operating system for Macintosh computers.

macOS Sierra (version 10.12) is the thirteenth major release of macOS (formerly known as and ), Apple Inc.'s desktop and server operating system for Macintosh computers.

The architecture of macOS describes the layers of the operating system that is the culmination of Apple Inc.'s decade-long research and development process to replace the classic Mac OS.

macOS malware includes viruses, trojan horses, worms and other types of malware that affect macOS, Apple's current operating system for Macintosh computers.