Apple
The Macintosh Operating System (Mac OS) was created to provide an operating system for the Macintosh computer.
Apple Inc.
If you are referring to the operating system then a Mac's default operating system is called Mac OS X. A Mac can be downgraded to run most versions of the Windows operating system from XP to 7.
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Apple is responsible for developing the Mac operating System.
The Mac OS was designed by Apple as the operating system for their Macintosh range of computers. The first Mac OS, originally known as System Software, was introduced with the first Macintosh in 1984. Over the years the original Mac OS was developed, improved and expanded until Mac OS 9 in 2001. For version 10 Apple reworked the Mac OS around a UNIX core and this is known as Mac OS X.
Software is written to use the facilities provided by a particular operating system. A Mac's default operating system is Mac OS X. A Mac can also run the Windows operating system. If the Mac has the required operating system to support the software on the external drive then it can run it.
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Mac OS X
Mac OS
Apple made first use of the sidebar in its computing operating system called "Mac OS". The original version of this operating system was introduced in 1984 and was termed "System".
The current operating system for Macintoshes, Mac OS X, is developed by a team of software engineers at Apple. It was built on the NeXTSTEP operating system for NeXT computers that Apple acquired when they purchased the NeXT company in 1996.