MacOS

macOS, previously OS X and originally Mac OS X, is a Unix-based operating system developed and marketed by Apple since 2001. It is the current operating system for Apple's Mac computers. Within the market of desktop and laptop computers, it is the second most widely used desktop OS, after Microsoft Windows and ahead of all Linux distributions, including ChromeOS and SteamOS. , the most recent release of macOS is macOS 15 Sequoia, the 21st major version of macOS.

Mac OS X succeeded classic Mac OS, the primary Macintosh operating system from 1984 to 2001. Its underlying architecture came from NeXT's NeXTSTEP, as a result of Apple's acquisition of NeXT, which also brought Steve Jobs back to Apple. The first desktop version, Mac OS X 10.0, was released on March 24, 2001. Mac OS X Leopard and all later versions of macOS, other than OS X Lion, are UNIX 03 certified. The derivatives of macOS are Apple's other operating systems: iOS, iPadOS, watchOS, tvOS, audioOS and visionOS. macOS has supported three major processor architectures: originally PowerPC-based Macs in 1999; Intel Core-based Macs from 2006; and self-designed 64-bit Arm Apple M series Macs since 2020.

A prominent part of macOS's original brand identity was the use of Roman numeral X, pronounced "ten", as well as code naming each release after species of big cats, and later, places within California. Apple shortened the name to "OS X" in 2011 and then changed it to "macOS" in 2016 to align with the branding of Apple's other operating systems. In 2020, macOS Big Sur was presented as version 11—a marked departure after 16 releases of macOS 10—but the naming convention continued to reference places within California. In 2025, Apple unified the version number across all of its products to align with the year after their WWDC announcement, so the release announced at the 2025 WWDC, macOS Tahoe, is macOS 26. Provided by Wikipedia