Debian is an OS which uses the Linux kernel. Even though it is usually set up on desktops, it's being used on more and more web servers too. The reason is that it's really stable, so a server running it won't need to be restarted for months. Debian is also regarded as being one of the most protected Operating Systems available, because security patches are released within days after an issue is discovered. This is possible since thousands of qualified developers are part of the Debian project on a voluntary basis and not only do they work on the OS itself, in addition, they provide 24/7 support through special e-mail lists and respond within twenty minutes to any question. In this light, you'll obtain 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 releases with the highest number of packages - more than 30,000. As the Operating System is absolutely free to use, you can modify both the core as well as all the packages in the way you see fit. In addition, you won't need to pay any license fees.