Debian is an Operating System that uses the Linux kernel. Although it is usually set up on desktops, it is being used on a growing number of web servers too. The reason is that it's very stable, so a server running it won't need to be restarted for months. Debian is also considered to be among the most risk-free Operating Systems to choose from, since security patches are released within days after a problem is found. This is possible since thousands of well-experienced developers are employed by 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 in twenty minutes to any question. In this light, you will enjoy top-notch 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 - over 30,000. As the Operating System is absolutely free to use, you can modify both the core as well as any of the packages in any way you see fit. Furthermore, you won't need to pay any license fees.