Linux is a family of free and open-source software operating systems built around the Linux kernel. Linux is usually packaged in a form known as a Linux distribution (or distro for short) for both desktop and server use - e.g. Ubuntu. The defining component of a Linux distribution is the Linux kernel.
Popular Linux distributions include: Arch Linux, CentOS, Debian, Fedora, Gentoo Linux, Linux Mint, Mageia, openSUSE and Ubuntu, as well as commercial distributions such as Red Hat Enterprise Linux and SUSE Linux Enterprise Server. Many smartphones and tablet computers run Android and other Linux derivatives.
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