Linux is an operating system, which is free and open-source. Linux is the name given to all of the UNIX-like operating systems that are based on the Linux kernel. Those different operating systems are called Linux Distributions.
It is probably the most popular free open-source software there is.
Linux is a part of the LAMP bundle, where the L stands for Linux OS. The different distributions of Linux are targeted at different user groups. They differ in interface, system tools, and various other features:
The desktop distributions are used mainly in the home or in the office, by end users.
The server distributions are as the name suggests used for servers. Lots of the desktop distributions can and are being used as server distributions as well.
The most popular distributions of Linux are Debian, Ubuntu, Fedora, Linux Mint, CentOS, openSUSE and many others.
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