On August 28,, it was released worldwide, and was made available for purchase from Apple' s website and its retail stores at. macOS ( / ˌ m æ k ʔ oʊ ˈ ɛ s / ; previously Mac OS X and later OS X, Roman numeral " X" pronounced " ten" ) is a series of graphical operating systems developed and marketed by Apple Inc.
It is the primary operating system for Apple' s Mac family of computers. Within the market of desktop, laptop and home computers, and by web usage, it is the second most widely used desktop OS.
macOS Transformation Pack 4.