MacOS is a Unix-based operating system developed by Apple, which is closed source like Windows. 

It offers even less customisability then Windows, but there are a few settings the user can change.

MacOS is also considered a pretty secure operating system as Apple has more control over the programs you can install and where you install them from.

The command line interface on MacOS is more powerful then the one on Windows but not quite as powerful as on Linux. MacOS has it's own package manager though, Brew, which makes installing packages, especially for software development, easy.

There are also lots of apps available for MacOS, especially for professional work such as photo or video editing, but there are not as many apps as for the other operating systems, for example there are very few games developed for MacOS.

Overall, MacOS has some similarities with bot operating systems, but is not as general purpose as the other two. Many professionals and companies use MacOS due to it's apps for them and it's good performance.
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