Since Linux is a free, Open Source operating system, anyone can create their own package of Linux and distribute it. A distribution then is simply a package of the Linux kernel, some added software, and some default config files.
Each "distro" (short for distribution) has its own advocates, and comes with its own set of strengths and weaknesses. Some of the major differences are how and where each distribution places files on the filesystem, and the set of core software installed with the system.
To help you choose the distro you'll call your own, or to find out what you might be missing, click the logos for each distro below.
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