Mac OS X, a series of Unix-based operating systems, has been included with all new Macintosh computer systems. It has been Apple's primary operating system, is the successor to Mac OS 9, the final release of the "classic" Mac OS. Mac OS X architecture implements a layered design. The layered frameworks aid rapid development of applications by providing existing code for common tasks.
Mac OS X's core is a POSIX compliant operating system (OS) built on top of the XNU kernel, with standard Unix facilities available from the command line interface. Apple has released this family of software as a free and open source operating system named Darwin. On top of Darwin, Apple layered a number of components, including the Aqua interface and the Finder, to complete the GUI-based operating system which is Mac OS X.
Mac OS X includes its own software development tools, most prominently an integrated development environment called Xcode. Xcode provides interfaces to compilers that support several programming languages including C, C++, Objective-C, and Java. For the Apple–Intel transition, it was modified so that developers could build their applications as a universal binary, which provides compatibility with both the Intel-based and PowerPC-based Macintosh lines.
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