macOS (previously OS X and originally Mac OS X) is a proprietary Unix-like [6][7] operating system, derived from OPENSTEP for Mach and FreeBSD, which has been marketed and developed by …

Here's everything you need to know about the latest version of macOS and every version of the Mac operating system from Cheetah to Tahoe.

Aug 31, 2025 · Below the break is a table showing all major releases of macOS (previously Mac OS X) from the public beta through the latest released update, which is 15.1.1, as of Novembver 20, 2024 …

Nov 24, 2025 · The first ancestor of the macOS family was Mac OS X Public Beta released in 2000, followed by a public release of Mac OS X 10.0 in 2001. Let’s recount the stories of all Mac OS X …

Dec 12, 2025 · macOS (aka OS X, Mac OS X) is the primary operating system for Apple’s Mac computers. ... Major versions of macOS are released once a year now and usually maintained for …

Dec 18, 2025 · Download and install current or previous versions of the Mac operating system on compatible Mac computers.

New versions of MacOS installers are typically available through the Mac App Store, accessed through a computer that is compatible with the latest Mac system software release. Older versions of Mac OS …

A comprehensive visual history of Mac OS X from 2001 to 2025. See a gallery of the Mac OS X evolution from the beginning to present day.

OS X (pronounced oh ess ten) is the brand name of a series of Unix-compatible operating systems and graphical user interfaces developed, marketed, and sold by Apple Inc. Since 2002, Mac OS X has …

Jun 20, 2023 · What is OS X Base System? OS X Base System generally refers to Apple's recovery partition that is included on the hard drive of Mac computers. This recovery system is a critical …