Debian is an Operating System that uses the Linux kernel. Even though it is usually set up on desktop computers, 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 will not need to be restarted for months. Debian is also considered to be among the most protected Operating Systems available, since security patches are released within days after an issue is discovered. This is possible since thousands of skilled developers are employed by the Debian project on a voluntary basis and not only do they work on the OS itself, in addition, they provide 24/7 support via special mailing lists and respond within twenty minutes to any question. In this light, you'll get 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'll be able to modify both the core and all of the packages in any way you see fit. In addition, you will not be required to pay any kind of license fees.