Is Mac Linux?

I've tried doing a search but not really finding anything specific. Is the Mac OS based off of Linux or Unix? At the OS level it appears exactly like Linux other than the directory structures and such. Is it based off Linux or is it a completely separate OS?
Thanks,
glenn

BSD and FreeBSD are not Linux, they are Unix. NEXTSTEP was an OS based on the Mach kernel, which is a Unix kernel, and BSD Unix. OS X is derived from NEXTSTEP, and based on a Mach kernel and BSD Unix.
Linux is not Unix.

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