What is the difference between OS X and Darwin OS?

Starting from OS X 10.0 to the current version in the OS from Apple is also included Darwin OS, but how can they work together and what is their difference?
July 2nd 19 at 13:24
1 answer
July 2nd 19 at 13:26
Darwin does not include many elements of Mac OS X, such as the Carbon and Cocoa APIs or the Quartz composer and the user interface is Aqua, so it can't run Mac apps.

https://ru.wikipedia.org/wiki/Darwin

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