macOS is a Unix-based operating system, developed and marketed by Apple Inc. It is designed to run on Macintosh computers, having been pre-installed on all Macs since 2002. Within the market of home computers, and by web usage, macOS is the second most widely used desktop OS after Windows.
macOS Big Sur elevates the world's most advanced desktop operating system to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.