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 is really stable, so a server running it will not need to be restarted for months. Debian is also considered to be among the most risk-free Operating Systems you can get, since security patches are released within days after a problem is discovered. This is possible since thousands of skilled 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 through special e-mail lists and reply within twenty minutes to any question. In this light, you will have top-level 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. Since the Operating System is completely free to use, you are able to modify both the core and all of the packages in any way you see fit. Also, you will not have to pay any license fees.