I have looked at 3 operating systems, Windows, Mac OSX and Linux.
Windows- Microsoft Windows is a series of software operating systems and graphical user interfaces produced by Microsoft. Microsoft first introduced an operating environment named Windows in November 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces.
Mac OSX- Mac is a series of operating systems and graphical user interfacesdeveloped, marketed, and sold by Apple Inc. Since 2002, Mac OS X has been included with all new Macintosh computer systems. It is the successor to Mac OS 9, the final release of the “classic” Mac OS, which had been Apple’s primary operating system since 1984.
Linux- Linux is a generic term referring to Unix-likecomputer operating systems based on the Linux kernel. Their development is one of the most prominent examples of free and open source software collaboration; typically all the underlying source code can be used, freely modified, and redistributed, both commercially and non-commercially, by anyone under licenses such as the GNU General Public License.
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