Linux Logo — GNU / Linux is one of the terms used to refer to the combination of the core or kernel free similar to Unix called Linux , which is used with system toolsGNU . Its development is one of the most prominent examples of free software , all its source code can be used, freely modified and redistributed by anyone under the terms of the GPL ( L ICENSE P ublic G eneral of GNU , in English: G eneral P ublic L icense ) and a number of free licenses.

Although Linux is, strictly speaking, the operating system , central part of the interaction between the core and the user (or application programs) are usually handled with the tools from the GNU project or other projects like GNOME . However, a significant part of the community as well as many general and specialized media, prefer the term Linux to mean the union of the two projects. For more information see “Naming GNU / Linux” or article “Controversy over the name GNU / Linux ” .

A variant of this union of programs and technologies, which are added various application programs specific or general purposes are called distributions .Its aim is to provide editions that meet the needs of a particular user group. Some of them are especially known for its use in servers and supercomputers. which has the largest share of the market. According to an IDC report, GNU / Linux is used by 78% of the top 500 world servers, Another report gives a market share of 89% in the top 500 supercomputers. 5 with smaller market share GNU system / Linux is also used in the segment of desktop computers , laptops , palmtops , mobile phones , embedded systems , game consoles and other devices.

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