Debian is an Operating System that uses the Linux kernel. Although it is usually set up on desktops, it's being used on more and more web servers too. The reason is that it is really stable, so a server running it will not have to be restarted for months. Debian is also regarded as being one of the most protected Operating Systems to choose from, due to the fact that security patches are released within days after a problem is found. This is possible because thousands of well-trained developers are working for the Debian project on a voluntary basis and not only do they work on the OS itself, they also provide 24/7 support via special mailing lists and reply within 20 min to any question. In this light, you will get an outstanding level of support directly from the developers who know their own platform in depth, and not from a third-party support team. Debian is also one of several Linux releases with the highest number of packages - more than 30,000. Since the Operating System is absolutely free to use, you're able to modify both the core as well as any of the packages in any way you see fit. In addition, you will not have to pay any kind of license fees.