Debian is an Operating System which uses the Linux kernel. Although 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 regarded as being one of the most protected Operating Systems available, as security patches are released within days after a problem is found. This is possible since thousands of well-experienced 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 by using special e-mail lists and respond within 20 minutes to any kind of question. In this light, you will enjoy 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 among the Linux releases with the highest number of packages - more than 30,000. Since the Operating System is free to use, you'll be able to modify both the core and any of the packages in the way you see fit. In addition, you will not have to pay any kind of license fees.