Debian is an OS which uses the Linux kernel. Even though it is usually set up on personal 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 won't need to be restarted for months. Debian is also considered to be one of the most secure Operating Systems to be found, due to the fact that security patches are released within days after a problem is discovered. This is possible because thousands of well-experienced developers are part of 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 mailing lists and respond within twenty minutes to any question. In this light, you'll enjoy top-level 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 the Linux distributions with the highest number of packages - more than 30,000. As the Operating System is absolutely free to use, you will be able to modify both the core and any of the packages in the way you see fit. In addition, you won't be required to pay any kind of license fees.