4 terms
Darwin is the open-source Unix-like core of macOS, combining the XNU kernel, BSD libraries and system utilities beneath Apple's proprietary interface layers.
Mac, originally Macintosh, is Apple's line of personal computers that run macOS, designed together as one hardware and software platform.
macOS is the Unix-based desktop operating system for Mac computers, combining the Darwin core with the Aqua interface, Finder, Dock and menu bar.
XNU is the hybrid kernel of macOS and other Apple operating systems, combining the Mach microkernel, a BSD layer and the I/O Kit driver framework.