Linux

Linux (Listeni/ˈlɪnəks/ lin-uks[5][6] or, less frequently used, /ˈlaɪnəks/ lyn-uks)[6][7] is a Unix-like and mostly POSIX-compliant[8] computer operating system assembled under the model of free and open-source software development and distribution. The defining component of Linux is the Linux kernel,[9] an operating system kernel first released on 5 October 1991 by Linus Torvalds.[10][11]

Linux was originally developed as a free operating system for Intel x86-based personal computers. It has since been ported to more computer hardware platforms than any other operating system.[citation needed] It is a leading operating system on servers and other big iron systems such as mainframe computers and supercomputers.[12][13][14] As of June 2013, more than 95% of the world's 500 fastest supercomputers run some variant of Linux,[15] including all the 44 fastest.[16] Linux also runs on embedded systems, which are devices whose operating system is typically built into the firmware and is highly tailored to the system; this includes mobile phones,[17] tablet computers, network routers, facility automation controls, televisions[18][19] and video game consoles. Android, which is a widely used operating system for mobile devices, is built on top of the Linux kernel.

The development of Linux is one of the most prominent examples of free and open-source software collaboration. The underlying source code may be used, modified, and distributed—commercially or non-commercially—by anyone under licenses such as the GNU General Public License. Typically, Linux is packaged in a format known as a Linux distribution for desktop and server use. Some popular mainstream Linux distributions include Debian, Ubuntu, Linux Mint, Fedora, openSUSE, Arch Linux, and the commercial Red Hat Enterprise Linux and SUSE Linux Enterprise Server. Linux distributions include the Linux kernel, supporting utilities and libraries and usually a large amount of application software to fulfill the distribution's intended use.