Debian is an Operating System which uses the Linux kernel. Even though it is usually set up on desktops, it is being used on an increasing number of web servers too. The reason is that it's really stable, so a server running it won't have to be restarted for months. Debian is also regarded as being one of the most protected Operating Systems nowadays, due to the fact that security patches are released within days after a problem is discovered. This is possible since thousands of well-trained developers are part of the Debian project on a voluntary basis and not only do they work on the OS itself, but they also provide 24/7 support via special mailing lists and reply in twenty minutes to any kind of question. In this light, you will have an outstanding level of support directly from the developers who know their own platform in detail, and not from a third-party support team. Debian is also among the Linux distributions with the highest number of packages - over 30,000. Since the Operating System is completely free to use, you can modify both the core and any of the packages in the way you see fit. In addition, you won't have to pay any license fees.