Debian is an Operating System which uses the Linux kernel. Even though it is usually set up on personal computers, it is 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 secure Operating Systems to be found, as security patches are released within days after a problem is found. This is possible because thousands of skilled developers work for the Debian project on a voluntary basis and not only do they work on the OS itself, in addition, they provide 24/7 support by using special mailing lists and respond within 20 minutes to any kind of question. Thus, you'll obtain top-notch 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 distributions with the highest number of packages - more than 30,000. As the Operating System is completely free to use, you are able to modify both the core and all the packages in any way you see fit. Furthermore, you won't be required to pay any license fees.