Debian is an OS which uses the Linux kernel. Even though it is usually set up on desktop machines, it's being used on a growing number of web servers as well. 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 among the most protected Operating Systems nowadays, because security patches are released within days after a problem is discovered. This is possible since thousands of experienced developers are working for 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 e-mail lists and respond within 20 minutes to any kind of question. Thus, you will enjoy 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 one of several Linux releases with the highest number of packages - over 30,000. Since the Operating System is free to use, you are able to modify both the core as well as all of the packages in the way you see fit. In addition, you will not be required to pay any license fees.