XNU [SEP] based on
XNU
XNU is the computer operating system kernel developed at Apple Inc. since December 1996 for use in the macOS operating system and released as free and open-source software as part of the Darwin operating system, which is the basis for the Apple TV Software, iOS, iPadOS, watchOS, tvOS, and audioOS operating systems. "XNU" is an abbreviation of "X is Not Unix".
Originally developed by NeXT for the NeXTSTEP operating system, XNU was a hybrid kernel combining version 2.5 of the Mach kernel
history that is largely independent of the classic Mac OS. It is a Unix-based operating system built on NeXTSTEP and other technology developed at NeXT from the late 1980s until early 1997, when Apple purchased the company and its CEO Steve Jobs returned to Apple. Precursors to the original release of Mac OS X include OpenStep, Apple's Rhapsody project, and the Mac OS X Public Beta.
macOS makes use of the BSD codebase and the XNU kernel, and its core set of components is based upon Apple's open