The Evolution of macOS – Every Version Explained (1984–2025)

This is the evolution and explanation of the Apple macOS operating system, from the first versions of System 1 on the first Macintosh, to the newest macOS, macOS Tahoe 26. See what are the essential changes that defined the platform: the transition from classic systems without multitasking to Mac OS X, then to OS X Mavericks, the emergence of the Aqua interface, the maturation of the Finder, the introduction of Spotlight and Safari, as well as major architectural transitions.